We've made a change to our Apple Music integration so that "appears on" albums (ie another artist's album where you're featured on a track) are no longer imported to your site. This change makes Apple Music consistent with our other music platform integrations like Spotify and Deezer.
In the future we hope to support "appears on" albums, as we know that's important to many of our artists, but currently our app and templates assume all albums on your site are yours. We're still researching the best way to handle these, so if you have any input, let us know.