[WASM] Attached property not works on wasm if the attached property is created by generator at same project

[SongOfYouth]

Current behavior

Attached property not works on wasm but works on windows.

Expected behavior

No response

How to reproduce it (as minimally and precisely as possible)

generate a attached property by source generator and reference it in xaml.

Workaround

No response

Works on UWP/WinUI

None

Environment

No response

NuGet package version(s)

No response

Affected platforms

WebAssembly

IDE

No response

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

I think it's same as #14409 ,but i don't know why it works on windows.

[jeromelaban]

Thanks for the report. Indeed, this is not something we can fix at this time, and this is caused by dotnet/roslyn#57239.