Summary (tl;dr) for all of those coming here looking for a quick solution
There are two ways to avoid those nasty clicks:
- you disable Amplitude Envelope Note Retrigger (AENR) in page 2 of the AMP section AND you apply some attack in AMP page 1 (5 was enough for me)
- if it doesn’t do the trick, also adjusting/reducing the decay so that when the next note is playing the previous one went silent or almost silent should work.