This started happening (or perhaps I finally noticed it) a couple of months ago. I don’t recall it happening for years prior to that. But okay some files are in use (maybe), these particular ones don’t seem likely however.
The main issue is the way these files are reported. It is tiny window with no obvious way to export the list and no way to tell what folders these files are part of.
Could some consideration be given to listing the path and even modifying the UI so (if we determined they are limited to a folder or two) would could exclude them with a simple click?