regression: turning off looping still has the particle plays in loop

case #897324

With mere hint from your title, I get the feeling that you are talking about disabling looping but the particle system isn’t stopped immediately. After checking in 5.3.5 and 5.6.0f2, both versions behave the same, i.e. for a particle system with 5s duration, if you disable looping the moment it begins playing, the particle system will continue to play until 5s. Unless this is a different case with 5.6.0f3. Most likely Unity technicians will mark this ticket as “by design” and close it. If you want to stop a particle system smoothly regardless of looping or not, you should disable Emission module instead.

Looping is off before play so when the system emits that’s already with no loop.