Placeholders are not updated in precompressed index.html files for published Blazor WebAssembly standalone apps

[danroth27]

Repro steps:

• Install .NET 10 Preview 4
• dotnet new blazorwasm
• dotnet publish -c Release
• Inspect the published index.html.br and index.html.gz files

Expected result: The placeholders in the compressed index.html files have been updated
Actual result: The placeholders are not updated:

This impacts Azure deployments that redirect to the precompressed files (Azure Static Web Apps, Azure App Service).

[maraf]

msbuild.rename_to_binlog.zip

The asset to compress is correctly using generated html, yet it results in using the original one with placeholders

EDIT: Got it! The RelatedAssetOriginalItemSpec has preference over RelatedAsset, see https://github.com/dotnet/sdk/blob/34920afc822f341917a48b5bc0a960b12735ce11/src/StaticWebAssetsSdk/Tasks/Utils/AssetToCompress.cs#L15

EDIT2: The metadata is added ResolveCompressedAssets