I'm not an expert but some of what I know includes the following, used to be after V/S'ing down to the slope if the airspeed increases to above Vfe you would encounter a reversion to OPEN descent, now the airplane just reduces the V/S and does not revert! Also I can't select .82 now, but you can select airspeed instead of Mach and nudge the cruise speed up toward Mmo. Don't have an answer to your scenario.
D.L.
