if you have activated sidecars for videos and categorise a video, XMP automatically creates an .xmp file and saves the categories there.
If you now move the video including the .xmp to a new folder in Windows Explorer, XMP ignores the content of the .xmp file. In older versions, the categories were imported. This is a catastrophe for me because I have moved hundreds of videos and nothing is categorised any more.

We had the same problem 2 years ago: viewtopic.php?f=104&t=43341
Categorise a video in folder 01:
Move video and .xmp to another folder:
XMP don't import the saved categories:
For testing purposes, I started with fresh settings and only changed attached settings.