Cannot run "dotnet publish" for windows desktop if referenced project targets netX-android or netX-ios

[gentledepp]

Describe the bug

I am not sure if this belongs here.
I created a repro here: https://github.com/gentledepp/AvaloniaXpatTest/tree/repro/publishbreaks

This is a very simple out-of-the-box Avalonia XPat application.
Running
dotnet publish .\avaloniaxpattest.desktop\AvaloniaXpatTest.Desktop.csproj -c Release -r win-x64 --self-contained true -o ./publish/x64

works fine, as long as the AvaloniaXpatTest project does not have the following target frameworks defined:
<TargetFrameworks>net9.0;net9.0-windows;net9-android;net9-ios</TargetFrameworks>
so when adding "net9-android" or "net9-ios", the build breaks with:

This command was can also be found in the repository (publish.ps1)

To Reproduce

• clone https://github.com/gentledepp/AvaloniaXpatTest/
• checkout repro/publishbreaks
• run
  dotnet publish .\avaloniaxpattest.desktop\AvaloniaXpatTest.Desktop.csproj -c Release -r win-x64 --self-contained true -o ./publish/x64

all is good.

• Add ';net9-android;net9-ios' to the <TargetFrameworks> AvaloniaXpatTest.csproj
• run
  dotnet publish .\avaloniaxpattest.desktop\AvaloniaXpatTest.Desktop.csproj -c Release -r win-x64 --self-contained true -o ./publish/x64

not good:

Expected behavior

that it publishes without errors

Avalonia version

11.2.4

OS

Windows

Additional context

No response

[timunie]

That is why the X-plat template has a project for each target. Platform specific code should go there.