Visual Studio: unable to comment on code review with "closed by ()" message

I've seen a few times the following strange issue with new code reviews: when reviewer is trying to open newly created code review, he is unable to add any comments and there is a message displayed "closed by  ()":

The solution is the following:

1. Close all Visual Studio instances
2. Delete all files from this directory: 
   VS 2019: "%LocalAppData%\Microsoft\Team Foundation\8.0\Cache"
   VS 2022: "%LocalAppData%\Microsoft\Azure DevOps\8.0"