Unexpected trim warnings from referenced assemblies

.NET 11 Preview 4 has a bug where unexpected trim warnings may show up for assemblies from PackageReference/ProjectReference.

The trimming defaults are supposed to show at most one trim warning per PackageReference/ProjectReference assembly (see https://learn.microsoft.com/en-us/dotnet/core/deploying/trimming/trimming-options#show-detailed-warnings). .NET 11 Preview 4 will show detailed warnings for these assemblies due to a regression introduced in #125630.

This is fixed in P5.

Fixed in #127656 (filed the issue for posterity).

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