I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

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@pranavkm looks like there's a WASM publishing test that's failing with IL warnings around trimming:

Microsoft.NET.Sdk.BlazorWebAssembly.Tests.WasmPublishIntegrationTest.Publish_MinimalApp_Works [FAIL]
 C:\h\w\9D9008E8\w\B40B09BE\e\Assets\.nuget\packages\microsoft.netcore.app.runtime.mono.browser-wasm\6.0.0-rc.1.21401.3\runtimes\browser-wasm\lib\net6.0\System.Linq.Expressions.dll : warning IL2104: Assembly 'System.Linq.Expressions' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries [C:\h\w\9D9008E8\t\dotnetSdkTests\bzi5s2ak.s2x\Publish_Minim---C83C20DE\blazorwasm-minimal.csproj]
      C:\h\w\9D9008E8\w\B40B09BE\e\Assets\.nuget\packages\microsoft.netcore.app.runtime.mono.browser-wasm\6.0.0-rc.1.21401.3\runtimes\browser-wasm\native\System.Private.CoreLib.dll : warning IL2104: Assembly 'System.Private.CoreLib' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries [C:\h\w\9D9008E8\t\dotnetSdkTests\bzi5s2ak.s2x\Publish_Minim---C83C20DE\blazorwasm-minimal.csproj]
        Creating "obj\Debug\net6.0\linked\Link.semaphore" because "AlwaysCreate" was specified.

@eerhardt do you know what may be causing this? Thanks!

It looks like it is probably dotnet/linker#2145 that is causing this. To fix it, we will need to wait for dotnet/runtime#56593 to be merged and then flown into the SDK.

cc @agocke @sbomer

If this is waiting on runtime we'll need to resolve #19495

closing this in favor of #19495