I have reported this to Presonus.
I have a Hydrasynth which supports MPE.
If I enable MPE on the instrument
Create an instrument track for the hydra
Create a one bar part that simply alternates between two notes on quarter notes
On playback, I expect to hear the current patch on the hydra played four times (alternating notes) silence should occur at some point after the end of the bar is passed (depending on reverb and envelopes).
What actually happens is that one or more notes will get stuck and sound until you actually stop playback.