Resolved 2022.1.21f - "xxxxx has no meta file, but it's in an immutable folder. The asset will be ignored."

I recently attempted to update to 2022.1.21f from 2022.1.13f in two separate projects and am inundated by "xxxxx has no meta file, but it's in an immutable folder. The asset will be ignored." errors (about 600 errors in each project citing files from many different packages). I tried removing the Packages directory and also tried to load a fresh copy of the projects from my source repo, none of which worked. Is there a known solution to this problem?

 

I resolved this by upgrading to 2022.1.22f1.I guess this was a bug in 2022.1.21f1.

 

Im using Unity 2021.3 and recently had this problem..can you suggest any solution?

 

Sorry, no. I fixed it by upgrading Unity, so I don't what the real solution is.