Does my jellyfin not like AC/DC ?

[pixel24]

I was able to find the problem :-) (see attachment)

I looked in the metadata editor. There was a completely wrong BusicBrainz artist ID on the main folder "ACDC". I don't know where Jellyfin got this from.

In my files there was (from MusikBrainz Picard) the correct ID. I copied this into the metadata editor and manually entered "AC/DC" as artist and album artist for each track. After that everything was correct