I you are playing a track from a "Various Artist" album you expect to see the tag from the ARTIST field be displayed in the sonos player so that you can see the artist.
But as of today the tag ALBUM ARTIST is displayed.
On a Various Artist album the ARTIST tag will be the actual artist for each track and the tag ALBUM ARTIST will be "Various Artists" for the whole album.
Playing the same track from the same album through Subsonic on Sonos will display the correct tag I.E. the ARTIST tag.