Empty folders being deleted

I have opus 12.17.
For some reason, empty folders in sub directories keep being deleted.
This has not happened in the 10 years i've used opus. Did something change?
How do I keep empty folders and NOT have them automatically deleted?

Folder is on a Nas Drive, if that matters

Opus doesn't delete anything by itself, including empty folders. Maybe you have some sort of scheduled cleanup task running? Or the NAS software may be doing it itself?