This package has some extra caveats when building the .nupkg file.
The packaging for this project needs to be done with the nuget executable, rather than dotnet. This is due to a longstanding issue where dotnet pack does not include referenced projects in the build.
The commands to build and pack:
dotnet build /p:Configuration=Release
nuget pack -Prop Configuration=Release -IncludeReferencedProjectsWhen making changes, you will need to ensure that any updates to dependencies or version number are reflected in both the .csproj and .nuspec files.
This document will be updated if Microsoft fix the issue.