Microsoft.CodeAnalysis.CSharp 4.13.0 causes build error Error CS0234 : The type or namespace name .. does not exist in the namespace .. (are you missing an assembly reference?)

[tomohisa]

Version Used:
Microsoft.CodeAnalysis.CSharp 4.13.0

Steps to Reproduce:

1. clone J-Tech-Japan/Sekiban@3e81ce9
2. ‎src/Sekiban.Pure.SourceGenerator/Sekiban.Pure.SourceGenerator.csproj 4.12.0 Microsoft.CodeAnalysis.CSharp does not raise error
3. ‎src/Sekiban.Pure.SourceGenerator/Sekiban.Pure.SourceGenerator.csproj 4.13.0 Microsoft.CodeAnalysis.CSharp DOES raise error

A minimal repro, with source-code provided, is ideal. Most compiler/language issues can be distilled into a snippet that can be pasted into sharplab.

Diagnostic Id:

If this is a report about a bug in an analyzer, please include the diagnostic ID and message if possible (e.g. "IDE0030: Use coalesce expression").

Expected Behavior:

can reference generated code.

Actual Behavior:

when I use 4.13.0, it can not reference Generated code.