Yeah, I've encountered this same problem. I was able to find a solution through Personalized Cleaning Services (Alberta, Canada) - Home Spritz https://homespritz.ca/personalized-cleaning-services/, but I am not sure if this solution will help me out in any way in the future.

On our large project we often find Unity checking out a lot of files from Perforce that we don't expect. Sometimes the solution is to delete the Library folder to force a full reimport - unfortunately this gives the illusion of cleaning up the problem because deleting the Library folder removes the P4 credentials, meaning that of course nothing gets checked out during the import because Unity isn't talking to P4.