xunit.runner.visualstudio 2.1.0 result in 2.1 in the package folder name when restoring #1708

I use this in my paket:
nuget xunit.runner.visualstudio version_in_path: true

The first paket install, it results in xunit.runner.visualstudio.2.1.0 in packages folder and the .csproj refers to this folder.

The paket restore, it results in xunit.runner.visualstudio.2.1 in packages folder and it breaks the references in .csproj.

The second paket install, it tried to update the reference to xunit.runner.visualsudio.2.1, which is an inconsistant behavior with the first install.