Dotnet CLI --os and --arch flags are being ignored if RuntimeIdentifiers tag is declared in csproj

[Arkatufus]

Describe the bug

Dotnet CLI --os and --arch flags are being ignored if RuntimeIdentifiers tag is declared in csproj (project is set as a multi-arch project).

To Reproduce

Create a C# project with these tags:

<PropertyGroup>
  <OutputType>Exe</OutputType>
  <EnableSdkContainerSupport>true</EnableSdkContainerSupport>
  <ContainerRepository>idle-cpu</ContainerRepository>
  <ContainerTitle>idle-cpu</ContainerTitle>
  <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
  <RuntimeIdentifiers>linux-x64;linux-arm64</RuntimeIdentifiers>
</PropertyGroup>

Publish the project using this CLI command:

dotnet publish --os linux --arch x64 -p:ContainerRepository=idle-cpu -p:ContainerImageTag=latest-x64 -c Release /t:PublishContainer

Expected Behavior

A single docker container image targeting linux-x64 runtime with "latest-x64" tag

Observed Behavior

Two docker container images were created and pushed with "latest-x64-linux-x64" and "latest-x64-linux-arm64" tags (tag names were mangled)

[baronfel]

Sorry you're having this problem. This is a duplicate of #46053, which we've fixed in #46067 for next month's servicing releases. There's no good user-level fix for this issue, so the best suggestion I can give is to pin to last month's version of the SDK (either 8.0.404 or 9.0.101) for a couple of weeks until that is released.

[Aaronontheweb]

Thanks @baronfel

[Arkatufus]

Thank you for the explanation @baronfel