You may have (had) another album in your library, which was supposed to be matched to this pairing of artists.
However, Plex doesn’t support more than one artist as AlbumArtist, so that album has been matched to Miles Davis, but the artist name has been overwritten with the name of the pairing.
Find all albums which involve Miles Davis, solo or accompanied, and Plex Dance them.
If you still have that album with the pairing in your library, tag it with Miles Davis as AlbumArtist and put the name of both artists into the regular Artist tag.
