Try turning on Env Retrigger in the program menu and see if that fixes it.
I just tried that and it doesn't help.
After playing with it a bit more, here are replication steps:
1. Init patch
2. Play and hold 5 notes (C, G, C, G, C works easily enough)
3. Press sustain pedal
4. Release 5 keys. All 5 will continue playing (sustained)
5. Press and hold 5 different notes (e.g. D, A, D, A, D). All 5 new notes will sound.
6. Release sustain. All held notes stop sounding despite the keys being held down.
That's a regression bug. Held notes should continue playing after the sustain pedal is released.
The previous fix helped a little, but this is still broken in 1.0.0.13. (I assume it hasn't been fixed yet in 1.0.0.14 either, but I'll test that in a few minutes)