Hey @tommy_turntable – I wrote many words about this subject yesterday. Give it a read, or if you want the short version:
In order to treat the artist tag like a credit (which is what you’re seeing for Performed By), we currently require that the album artist field be present. If you add a tag for album artist that says “Various Artists” and rescan the album, I think you should get the behavior you’re looking for here.
Thanks!