Here you go:
https://youtu.be/tjbhHdUiZnk
There was some audio but apparently my mic is broken.
Basically, NCrunch seems to remove the package that was added last (Shoudly) to the unit tests project.
After re-adding the package, NCrunch didn't pick this fact up, so I had to manually start a rebuild process, which triggered the package removal again.
In a different SLN it removed a package (MediatR) from the only assembly in the project.
Hope this helps.