Missing discnumber makes album non-compliant
I can already disc number as "must be present", but a missing disc number doe not make the album non-compliant.
No... but what car and radio system is this?
Frank Köhntopp commented
Oh - and while you're at it, is TrackTotal and DiscTotal supported as well? If they're missing it messes up sorting on my car radio...
Sounds like a bug, can you send a debug archive?