When I add an album in Picard where the cover art is tagged as “cover” and “booklet”/“poster” at the same time, the album always shows up as modified. Saving works, but the next time the album is added, it again shows up as modified. It seems like the extra tag on cover art is not saved in Picard.
Examples of albums where this happens for me:
I have been removing the booklet tag from cover art to fix this (probably not the right thing to do). However, doing that even did not help in some of the cases.
It would be nice to fix this, so saved albums show up as unmodified again.