Recognize

I am not familiar with these, but it seems it’s automated tagging? Then it depends how it writes the tags and the separators. Try viewing the tags in Musicbrainz or some other manual tagging software to check.

How are you tagging those and in which tagging software?

Navidrome should recognize both album-artists and artists. In my phone app (Symfonium) I see them separately and I can browse by individual artists or by album-artists.