offline tarball build fails because of Microsoft.WindowsDesktop.App.Ref reference

[MichaelSimons]

Build fails with numerous errors like the following:

 /repos/tarball-broken/src/roslyn/artifacts/source-build/self/src/src/Compilers/Core/Portable/Microsoft.CodeAnalysis.csproj : error NU1101: Unable to find package Microsoft.WindowsDesktop.App.Ref. No packages exist with this id in source(s): prebuilt, previously-source-built, reference-packages, source-built [/repos/tarball-broken/src/roslyn/artifacts/source-build/self/src/Roslyn.sln]

Failing CI build (internal Microsoft link)

[dotnet-issue-labeler]

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

[MichaelSimons]

There are two version getting reported in the prebuilts report for roslyn

    <Usage Id="Microsoft.WindowsDesktop.App.Ref" Version="3.1.0" />
    <Usage Id="Microsoft.WindowsDesktop.App.Ref" Version="6.0.8" />

By inspecting the binlog, it appears the 6.0.8 version gets loaded by two project (CompilersBoundTreeGenerator and csc). I don't see where the 3.1.0 version comes from.

Given these are TFM6.0 related I am moving this to 7.0 RC2 where #2966 is expected to land.

[MichaelSimons]

This was fixed with dotnet/roslyn#63598 but is waiting to flow in.