Hi,
I checked NuGet update for Studio.AssemblyResolver. It seems that Studio.AssemblyResolver is not updated to support Studio2021.
When will Studio.AssemblyResolver support Studio2021?
I met same problem on Studio 2019 before and reported.
Here is the link.
community.sdl.com/.../studio-assemblyresolver-supports-studio2019
Thanks,
Masayuki