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Describe the bug
Using ReactiveUI.Uno.WinUI, my ViewModel throws RuntimeExceptions like 'The application called an interface that was marshalled for a different thread', despite using ObserveOn(RxApp.MainThreadScheduler).

Also code like RxApp.MainThreadScheduler.Schedule(() => IsBusy = false), the delegate is not executed on the main thread.

Steps To Reproduce

Small solution based on latest visual studio Uno template, Windows only.

UnoWinUI_ReactiveUI_MainThreadScheduler.zip

Provide the steps to reproduce the behaviour:

1. type something in the search textbox.
2. A TextBlock bounded to ViewModel.SearchResult ends in the error.
   ​

Expected behaviour
I am expecting the viewmodel property SearchResult to be set on the main thread, so it does not throw the 'marshalled for a different thread' exception.

Environment

• Windows: 11 Pro 22000.1042
• ReactiveUI Version: 18.3.1
• ReactiveUI.Uno.WinUI Version: 18.1.20

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Detected dependencies

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Currently, multithreading is not supported in WebAssembly.
When developing for Uno, at the moment I have to explicitly override TaskPoolScheduler so that the code works on all platforms.