Static Web Assets build error with .net 6 rc1 with .net 5 target

.NET 6 rc1 still breaks our open source AElemental library static web assets. This issue seems similar (or possibly identical?) to #19475 but the class library that fails is targeting .NET 5. I already opened #20008 for preview 7 but the same issue happens with rc1

2>C:\Program Files\dotnet\sdk\6.0.100-rc.1.21458.32\Sdks\Microsoft.NET.Sdk.Razor\targets\Microsoft.NET.Sdk.Razor.StaticWebAssets.5_0.targets(500,5): error : Static web asset 'C:\code\elemental-blazor\Elemental\wwwroot\css\elemental.min.css' has invalid source type ''. 2>Done building project "Elemental.csproj" -- FAILED.

Repro:

1. pull https://github.com/apption-oscode/elemental-blazor/tree/develop
2. Use .net SDK 6.0.100-rc.1.21458.32
3. Build solution in visual studio

Build did work with .net 6 preview 6 but breaks with .net 6 preview 7 and rc1.

[javiercn]

@robertmclaws I saw your commit and explicitly removed.

This was just some build stuff that got messed up and the fix didn’t make it into the RC2 bits.

[robertmclaws]

@javiercn That looks correct. However last night I checked in a change to the CloudNimble.BlazorEssentials.csproj file that works around the problem in RC2:

  <ItemGroup>
    <None Include="$(BaseIntermediateOutputPath)\$(Configuration)\net6.0\scopedcss\projectbundle\*.scp.css" Visible="false">
      <PackagePath>staticwebassets</PackagePath>
      <Pack>true</Pack>
      <InProject>false</InProject>
      <Visible>false</Visible>
    </None>
  </ItemGroup>

You may want to check to make sure that section was not in the build you just tested against.

Thanks!