Opening file - Invalid handles in Metatdata.

I’m getting error messages like this all the time. like every 1-2 min.
I can simly press “Try Again” and it works after that but it’s still very annoying.

3150546--239462--handleError.png
“Das Handle is ungülig” is german for “The handle is invalid”

One situtation there this happenes all the time is applying changes to a prefab.

I did delete my library yesterday and let it rebuild but that didn’t change anything.

Why exactly does that happen?

Push…

Bumped on the same issue. No answers ???