You can choose two sustain modes (on the bottom toolbar):
1) Legacy
2) Normal
In the manual it says "Define if the sustain is cut or maintained if a note is re-trigged while being already in sustain phase.".
I have tried both modes on the same sounds and haven't noticed any difference. I'm not sure if I misunderstand what it's supposed to do or if it's a bug.
If it's not a bug can someone point me to a preset where the difference is noticeable or explain me what it is? Thank you