Plex handling of music genres

There are many threads regarding the way how Plex handles genres, one of them is

“Genres are track specific, not album specific, so why does Plex do this?”

I have the same problem like desrcibed in this thread from 2021, but obviously the issue has not been resolved.
I have re-configured my music library to read the genres from the embedded tags, and re-scanned the library files, but I still do not find the track genres I use, but many genres I never use.

Do I really have to re-create the library with the embedded tags setting? Due to the fact that I have over 400.000 files I would be reluctant to do that.

Btw, ‘Artist genre’ is another metadata which is pretty useless imho.

You need to refresh metadata on the library, not just rescan the library