Hello @56legion ,
I’ve been reading several posts and it seems this bug has been around for quite a while.
The only solution that consistently seems to work is deleting the files directly from the file explorer with Unreal closed.This video explains how to do it.
Some people also mentioned that pinning the actors can help (though it only worked for a few), and others said that running Unreal as administrator might fix the issue.
Hope it helps !