https://listenbrainz.org/album/e632b2c4-affe-40cf-9749-4821e86aa18a is a Various Artists release with different track artists. All tracks display Various Artists

https://listenbrainz.org/album/b04abc66-999f-4f67-852d-41a5fb7965b3 has feat. artists but doesn't show.

More precisely it seems the first album artist is used but displays the full artist credit, for example "artist A & artist B" will be shown as such but links to artist A only