[Bug]: Blazor Arg_PlatformNotSupported regression after library update

[Dunge]

Describe the bug 🐞

I'm not sure exactly which one caused that, I updated the packages ReactiveUI and ReactiveUI.Blazor from 20.1.63 to 21.0.1 and also DynamicData from 9.2.1 to 9.4.1 (which I use together).

It seems to work in debug mode, but after publishing (which I know Blazor also do trimming) I'm getting a Arg_PlatformNotSupported exception, which didn't happen before.

(null) blazor.web.js:1:158912
Unhandled Exception: blazor.web.js:1:158912
System.PlatformNotSupportedException: Arg_PlatformNotSupported blazor.web.js:1:158912
   at System.Reactive.ObserveOnObserverLongRunning`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Schedule() blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Scan`2._[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null],[DynamicData.ChangeAwareCache`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.AutoDetachObserver`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNextCore(IChangeSet`2 ) 3 blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Where`1.Predicate._[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.AutoDetachObserver`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNextCore(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.Reactive.TailRecursiveSink`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Drain() blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) 2 blazor.web.js:1:158912
   at DynamicData.ObservableCache`2.<>c__DisplayClass30_0[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].<CreateConnectObservable>b__0(IObserver`1 observer) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at DynamicData.ObservableCache`2.<>c__DisplayClass20_0[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].<Connect>b__0(IObserver`1 observer) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) 2 blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[ChangeAwareCache`2](IObservable`1 , IObserver`1 ) 2 blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Defer`1._[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Run() blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) 4 blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].ScheduledSubscribe(AutoDetachObserver`1 autoDetachObserver) blazor.web.js:1:158912
--- End of stack trace from previous location --- blazor.web.js:1:158912
   at System.Reactive.ObserveOnObserverLongRunning`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Schedule() blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Scan`2._[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null],[DynamicData.ChangeAwareCache`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.AutoDetachObserver`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNextCore(IChangeSet`2 ) 3 blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Where`1.Predicate._[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.AutoDetachObserver`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNextCore(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.Reactive.TailRecursiveSink`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Drain() blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) 2 blazor.web.js:1:158912
   at DynamicData.ObservableCache`2.<>c__DisplayClass30_0[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].<CreateConnectObservable>b__0(IObserver`1 observer) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at DynamicData.ObservableCache`2.<>c__DisplayClass20_0[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].<Connect>b__0(IObserver`1 observer) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) 2 blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[ChangeAwareCache`2](IObservable`1 , IObserver`1 ) 2 blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Defer`1._[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Run() blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) 4 blazor.web.js:1:158912
   at System.Reactive.AutoDetachObserver`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnErrorCore(Exception ) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].ScheduledSubscribe(AutoDetachObserver`1 autoDetachObserver) blazor.web.js:1:158912
   at System.Reactive.Concurrency.CurrentThreadScheduler.Schedule[ValueTuple`2](ValueTuple`2 , TimeSpan , Func`3 ) blazor.web.js:1:158912
   at System.Reactive.Concurrency.LocalScheduler.Schedule[ValueTuple`2](ValueTuple`2 , Func`3 ) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) blazor.web.js:1:158912
   at ..Web.Blazor..Shared.Application.OnConnected() blazor.web.js:1:158912
   at System.Reactive.ObserveOnObserverLongRunning`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Schedule() blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Scan`2._[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null],[DynamicData.ChangeAwareCache`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.AutoDetachObserver`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNextCore(IChangeSet`2 ) 3 blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Where`1.Predicate._[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.AutoDetachObserver`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnNextCore(IChangeSet`2 ) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.Reactive.TailRecursiveSink`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Drain() blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) 2 blazor.web.js:1:158912
   at DynamicData.ObservableCache`2.<>c__DisplayClass30_0[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].<CreateConnectObservable>b__0(IObserver`1 observer) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at DynamicData.ObservableCache`2.<>c__DisplayClass20_0[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].<Connect>b__0(IObserver`1 observer) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[..Model.Containers.ContainerBase, ..Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Subscribe(IObserver`1 ) 2 blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[ChangeAwareCache`2](IObservable`1 , IObserver`1 ) 2 blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) blazor.web.js:1:158912
   at System.Reactive.Linq.ObservableImpl.Defer`1._[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].Run() blazor.web.js:1:158912
   at System.ObservableExtensions.SubscribeSafe[IChangeSet`2](IObservable`1 , IObserver`1 ) 4 blazor.web.js:1:158912
   at System.Reactive.AutoDetachObserver`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].OnErrorCore(Exception ) blazor.web.js:1:158912
   at System.Reactive.ObservableBase`1[[DynamicData.IChangeSet`2[[Client.ViewModels.HierarchyViewModel, Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], DynamicData, Version=9.4.0.0, Culture=neutral, PublicKeyToken=null]].ScheduledSubscribe(AutoDetachObserver`1 autoDetachObserver) blazor.web.js:1:158912
   at System.Reactive.Concurrency.CurrentThreadScheduler.Schedule[ValueTuple`2](ValueTuple`2 , TimeSpan , Func`3 ) blazor.web.js:1:158912

Step to reproduce

Blazor WASM project targeting net9 with ReactiveUI and DynamicData publish in release using an ObservableCache list

Reproduction repository

https://github.com/reactiveui/ReactiveUI

Expected behavior

.

Screenshots 🖼️

No response

IDE

No response

Operating system

No response

Version

No response

Device

No response

ReactiveUI Version

21.0.1

Additional information ℹ️

No response

[glennawatson]

I'm going to guess some sort of Scheduler has changed somewhere in there, and its attempting to fire off a non-supported WASM scheduler.

Using something like https://github.com/reactiveui/reactive.wasm might help and setting it to a WASM supported scheduler maybe.

GitHub

GitHub - reactiveui/Reactive.Wasm: A Web Assembly versions of the System.Reactive classes.

A Web Assembly versions of the System.Reactive classes. - reactiveui/Reactive.Wasm

[glennawatson]

So low down likely RxUI possibly, but likely the quick and easy fix is to install that Scheduler, and make sure you are using it with RxApp.MainThreadScheduler etc.

Long term let's keep the issue open so we get this happening automatically

[Dunge]

Ok thank you. I already have the RxApp.MainThreadScheduler set as my IScheduler singleton implementation, but the one from the main ReactiveUI package. So I just add the ReactiveUI.Wasm nuget to my solution and it should provide a different one?

I'll try that and see if it change anything. Otherwise I'll try downgrading version and try to find out at which one the problem started.

[Dunge]

Oh no sorry it's Reactive.Wasm, which seems to be already included as a dependency from ReactiveUI.Blazor.. so I believe my project already use it.

[ChrisPulman]

Are you using Reactive.Wasm V3.0.1?

[Dunge]

No, ReactiveUI.Blazor 21.0.1 was referencing Reactive.Wasm 2.1.2
I manually referenced Reactive.Wasm 3.0.1 and unfortunately it didn't help.

I then tried to disable AOT compilation and I get a slightly different error (always only after publishing in release):

MONO interpreter: NIY encountered in method Web.Blazor.Shared.ServiceBuilder:AddCommonServices (Microsoft.Extensions.DependencyInjection.IServiceCollection)
[MONO] * Assertion: should not be reached at /__w/1/s/src/mono/mono/mini/interp/interp.c:3993

This AddCommonServices() method is my DI service configuration method where I add ReactiveUI and others.
Apparently NIY meanas "Not Implemented Yet"

[Dunge]

Ok I did more tests. Always with AOT off (to simplify the analysis), always with a full dotnet publish -c Release and always deleting the obj/bin folders (which does influence, I believe it is what caused the previous error, it did not reappear), and always clearing my browser cache.

reactiveui 20.3.1 with splat 15.3.1 and dynamicdata 9.3.2 and reactive.wasm 2.1.2 -> work
reactiveui 20.4.1 with splat 16.1.1 and dynamicdata 9.4.1 and reactive.wasm 2.1.2 -> work
reactiveui 21.0.1 with splat 16.1.1 and dynamicdata 9.4.1 and reactive.wasm 2.1.2 -> Arg_PlatformNotSupported
reactiveui 21.0.1 with splat 16.2.1 and dynamicdata 9.4.1 and reactive.wasm 3.0.1 -> Arg_PlatformNotSupported

And yes I do call services.AddSingleton(RxApp.MainThreadScheduler);

And clarifying again: it does work in debug (latest version)! I believe the Blazor trimming has something to do with this.

[glennawatson]

Ah there were some assembly method name changes in a recent splat version so seems to be some mismatch with the DLL calls

Odd you are hitting it.

[StuYarrow]

I'm seeing something similar since upgrading to 21.0.1, with a somewhat different stacktrace. Is it the same issue? Does it shed any more light?

I'm just using the default scheduling setup and haven't played around with that at all.

crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: Arg_PlatformNotSupported
System.PlatformNotSupportedException: Arg_PlatformNotSupported
   at System.Threading.Thread.ThrowIfNoThreadStart(Boolean )
   at System.Threading.Thread.Start(Object , Boolean , Boolean )
   at System.Threading.Thread.Start(Object )
   at System.Reactive.Concurrency.ConcurrencyAbstractionLayerImpl.StartThread(Action`1 , Object )
   at System.Reactive.Concurrency.DefaultScheduler.LongRunning.LongScheduledWorkItem`1[[System.Reactive.ObserveOnObserverLongRunning`1[[ReactiveUI.ReactiveCommand`2.ExecutionInfo[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], ReactiveUI, Version=21.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]]..ctor(ObserveOnObserverLongRunning`1 , Action`2 )
   at System.Reactive.Concurrency.DefaultScheduler.LongRunning.ScheduleLongRunning[ObserveOnObserverLongRunning`1](ObserveOnObserverLongRunning`1 , Action`2 )
   at System.Reactive.ObserveOnObserverLongRunning`1[[ReactiveUI.ReactiveCommand`2.ExecutionInfo[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], ReactiveUI, Version=21.0.0.0, Culture=neutral, PublicKeyToken=null]].Schedule()
   at System.Reactive.ObserveOnObserverLongRunning`1[[ReactiveUI.ReactiveCommand`2.ExecutionInfo[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], ReactiveUI, Version=21.0.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(ExecutionInfo )
   at System.Reactive.Subjects.Subject`1[[ReactiveUI.ReactiveCommand`2.ExecutionInfo[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], ReactiveUI, Version=21.0.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(ExecutionInfo )
   at System.Reactive.SynchronizedObserver`1[[ReactiveUI.ReactiveCommand`2.ExecutionInfo[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], ReactiveUI, Version=21.0.0.0, Culture=neutral, PublicKeyToken=null]].OnNextCore(ExecutionInfo )
   at System.Reactive.ObserverBase`1[[ReactiveUI.ReactiveCommand`2.ExecutionInfo[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], ReactiveUI, Version=21.0.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(ExecutionInfo )
   at System.Reactive.Subjects.Subject.AnonymousSubject`2[[ReactiveUI.ReactiveCommand`2.ExecutionInfo[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], ReactiveUI, Version=21.0.0.0, Culture=neutral, PublicKeyToken=null],[ReactiveUI.ReactiveCommand`2.ExecutionInfo[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], ReactiveUI, Version=21.0.0.0, Culture=neutral, PublicKeyToken=null]].OnNext(ExecutionInfo )
   at ReactiveUI.ReactiveCommand`2[[System.Reactive.Unit, System.Reactive, Version=6.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263],[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]].<Execute>b__18_0()
   at System.Reactive.Linq.ObservableImpl.Defer`1[[System.ValueTuple`2[[System.IObservable`1[[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Action, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Eval()
   at System.Reactive.TailRecursiveSink`1[[System.ValueTuple`2[[System.IObservable`1[[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Action, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].<Drain>g__Unpack|7_0[ValueTuple`2](IObservable`1 )
   at System.Reactive.TailRecursiveSink`1[[System.ValueTuple`2[[System.IObservable`1[[Refit.IApiResponse`1[[OzoneDB.Shared.Models.Fabric[], OzoneDB.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Refit, Version=8.0.0.0, Culture=neutral, PublicKeyToken=2f9b1262776509f5]], System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Action, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Drain()
--- End of stack trace from previous location ---
   at OzoneDB.Client.Views.Fabrics.FabricsView.OnInitializedAsync()
   at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync() blazor.webassembly.js:1:45175

[glennawatson]

Believe it's the scheduler. You'll need to use the Reactive.Wasm package and the scheduler in there I think

[StuYarrow]

Believe it's the scheduler. You'll need to use the Reactive.Wasm package and the scheduler in there I think

Reactive.Wasm is included by ReactiveUI.Blazor and it 'just worked' before the update. I didn't find any documentation of breaking changes so it does look like a regression.

I also only see the exception after publishing the app, not running from the IDE with debug or release config.

I can't find any documentation of special scheduler setup for Blazor/WASM so I'm going to wait and see for now.

[ChrisPulman]

@StuYarrow Sounds like a Trimming issue, have you configured this?

[ChrisPulman]

If you are able to provide a minimal repo that demonstrates this issue, this may help us to resolve the issue quicker, or point you in the right direction for what is needed to make it work.

[StuYarrow]

I haven't configured trimming, so any trimming that is happening is by default.