I have Version 6.0, build 6245 (14de08a) on a iMac Pro (2017) Montery 12.2.1. I work over servers a lot, and for this most recent version of Photo Mechanic, it seems that it's leaving tmp files after applying a metadata template. These are duplicates of the original file (i.e. the original exists with the applied metadata), with a filename along the lines of tmp.{XXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}.jpg. It doesn't happen to all files (luckily) but it does happen frequently.
It could be something on our end, but I don't know of any changes that would prompt this. Thanks.