"Trim unused assemblies (in preview)" Publish option causes simple WPF app to crash immediately upon launching

* .NET Core Version: 3.1.100 Commit: cd82f021f4
* Windows version: Windows 10 v1909 OS Build 18363.476)
* Does the bug reproduce also in WPF for .NET Framework 4.8?: Unknown
* Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc...)? Probably not, but I am Publishing using Visual Studio.

**Problem description:**
A minimal .NET Core 3.1 WPF app with publish options "Produce Single File" and "Trim unused assemblies (in preview)" checked -> crashes immediately upon launching.

If I republish **without** checking "Trim unused assemblies (in preview)", it launches just fine.

**Actual behavior:**
Nothing appears to happen when executing the WpfCoreApp.exe file.

EventViewer says:
Description: A .NET Core application failed.
Application: WpfCoreApp.exe
Path: C:\code\WpfCoreApp\bin\Release\netcoreapp3.1\publish\WpfCoreApp.exe
Message: The application to execute does not exist: 'C:\Users\bignis\AppData\Local\Temp\.net\WpfCoreApp\gusxieru.uvn\WpfCoreApp.dll'.

**Expected behavior:**
A simple app with a few buttons appears

**Minimal repro:**
In Visual Studio 2019 v16.4.2, load the source code of this simple WPF app =
[WpfAppSourceCode.zip](https://github.com/dotnet/wpf/files/4048255/WpfAppSourceCode.zip)

Use these publish settings

and run the file \bin\Release\netcoreapp3.1\publish\WpfCoreApp.exe

nothing will happen and the error appears in the EventViewer.