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 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.