The test Microsoft.NET.Sdk.BlazorWebAssembly.Tests.WasmPublishIntegrationTest.Publish_HostingMultipleBlazorWebApps_Works is failing with a duplicate key error in the DiscoverPrecompressedAssets task:

error MSB4018: The "DiscoverPrecompressedAssets" task failed unexpectedly.
System.ArgumentException: An item with the same key has already been added.
Key: ...\BlazorMultipleApps.Shared\bin\Debug\netstandard2.1\BlazorMultipleApps.Shared.pdb

This was observed in codeflow PR #53613 (comment).

The fix has been merged in dotnet/runtime#126211. This requires a rebootstrap to pick up the fix. The test should be re-enabled once a new bootstrap SDK is available that includes the fix.