Blazor Assets 404 when using .net10 preview5 sdk

[dameng324]

Describe the bug

BlazorApp1.zip
I have 2 projects:

1. BlazorApp1: Blazor App project which expose Program.Run
2. BlazorBooter: reference BlazorApp1, and call Program.Run to start the application.

When using .Net10 preview5 sdk, getting the wwwroot assets will return 404.

It works when using .net9 sdk.

To Reproduce

.NET9 sdk

dotnet --version
9.0.301

dotnet run BlazorBooter:

browser:

.NET10 sdk

dotnet --version
10.0.100-preview.5.25277.114

dotnet run BlazorBooter:

browser:

You can use this demo and start BlazorBooter project to repro this bug: BlazorApp1.zip

change the comment in global.json will switch between .NET9 sdk and .NET10 sdk.

Exceptions (if any)

Further technical details

dotnet --info

.NET SDK:
 Version:           10.0.100-preview.5.25277.114
 Commit:            ddf39a1b46
 Workload version:  10.0.100-manifests.a07d1f1a
 MSBuild version:   17.15.0-preview-25277-114+ddf39a1b4

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.26100
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\10.0.100-preview.5.25277.114\

.NET workloads installed:
There are no installed workloads to display.
Configured to use workload sets when installing new manifests.
Workloads are configured to install and update using workload versions, but none were found. Run "dotnet workload restore" to install a workload version.

Host:
  Version:      10.0.0-preview.5.25277.114
  Architecture: x64
  Commit:       ddf39a1b46

.NET SDKs installed:
  8.0.411 [C:\Program Files\dotnet\sdk]
  9.0.205 [C:\Program Files\dotnet\sdk]
  9.0.301 [C:\Program Files\dotnet\sdk]
  10.0.100-preview.5.25277.114 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 9.0.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 10.0.0-preview.5.25277.114 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 9.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 10.0.0-preview.5.25277.114 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 9.0.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 10.0.0-preview.5.25277.114 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  C:\Users\wmx31\RiderProjects\BlazorApp1\global.json

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download