Probably not a common occurrence: an album with two performances of the same symphony, back to back with different orchestras and conductors (properly tagged as such). The first symphony grouped fine. However, after I tagged the start of the second performance (5th track), Roon opted to group it with the first performance. The result was one eight-movement, 53-minute symphony. Only Mahler does that, not Mendellsohn.
Poor picture below: doesn’t show the repeating set of movements.