Legacy versioning: How to delete old version sets?

I have reached the 10-set limit on version sets in Temporal Server 1.22.0.
This is due to 8 very old version sets that I created when I was learning how to use worker versioning. I can’t find any running workflow still using them.
I have read in the documentation and here on the forum that there is a “scavenger process” finding orphaned build IDs and deleting them, which should clear the obsolete version sets. However, this does not happen.
Is it possible that for some reason the scavenger process was disabled in my Temporal install?
Thank you for your help.