Yesterday I spent close to 1½h to fix my genres in my music library.
There were some entries like EDM;Dance;Pop;Dubstep
Instead of individual entries.
For specific entries I think you'd need to refresh + replace all metadata entries in the metadata or fixing the entry with the correct release group id.
I use .nfo files alongside the media. I usually delete them when some metadata get's "stuck" during refreshes.
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The server certainly should have picked up the change in metadata but I can't help you with why it didn't.
I can suggest that you edit the metadata in Jellyfin rather than using external tools and moving items in and out of the library. Just click the three-dot menu for a track or album and choose "Edit metadata". If it doesn't pick up changes made from Jellyfin then something is very wrong.
Hm, the only metadata I can see on the album level is the MusicBrainz IDs. That could explain why it is behaving this way, because MusicBrainz is the reason they are different to begin with, and I've had to force the change. I could change on the song level, and that was indeed the old values. However, changing these also did nothing.
All the three different artist versions have them same MusicBrainz artist ID. I tried to change these now into all using &, and it does change it, but now I have three identical entries instead. Trying to select them all and click "Group versions", it just spins and nothing happens.
I had a similar issue (different media types but) where Jellyfin would not, for any bleeping reason, update the metadata to reflect changes in the media.
After an annoying amount of fiddling I just yanked the library in it's entirety (as in, it was deleted) and then re-added it and on the new-library-scan everything updated.
Annoying, and maybe not entirely viable depending on how your library is structured - I have ~6 libraries for different things, so it wasn't that big of an issue - but it did resolve it.
I might need to do this at some point, but then I'd want to resolve all these small issues I have. I really wish it would be possible to just change it directly. I'll look for an issue on GitHub and submit one if I can't find it.
I had this exact same issue and many other odd things. The best advice I can give that worked for me was to one by one take each album off my server pass it through music brains (this looks for and edits metadata) and then place it back into Jellyfin.
It was well worth it in the end. I couldn't get Jellyfins metadata to work reliably for me, but this was the only issue I have had and the good Jellyfin provides once you have it 'cleaned' up is fantastic.
I would start using lidarr instead. Uses musicbrainz as well and can do the library management as well. Imo better than something like picard.
I only used picard in the beginning to fix my unsorted library and prepare for import in lidarr.
It is what I have tried, but Jellyfin still does not want to recognize the new metadata. :/
Did you try also deleting all of the old metadata, to try to get it back to a clean slate