Disc number metadata is ignored
Some albums consist of multiple CDs. This is also stored the song metadata.
I would expect this to show up under song info and as a sortable row in the library / playlists.
Album shuffle should also use this to determine the order use to play songs. First play disc 1 from beginning to end, then disc 2, etc. until all discs that are part of the album are finished.
Currently album shuffle first plays the following order track 1 of from discs sorted by track name, then the same for track 2, etc.