C++ Natvis for WinUI3 using collections and custom types

[torleifat]

So, I was having some issues with getting Natvis to work when debugging. Which lead me to this issue. I am using 1.1.5, but the issue is present. The work around described (copying the *.winmd files from Microsft.WindowsAppSDK into the debug folder) does work for some types, like the one described in the issue as an example.

However, the workaround does not seem to work for all types. For instance, my own types, or collections. I get some message in the output log saying:
Natvis C++/WinRT: Could not find metadata for Windows.Foundation.Collections.IObservableVector`1<MyDatamodel>

Does anyone know if I am doing something wrong here? The .winmd files which have the definition for these types should already be in the applications debug folder so I am at a bit of a loss.