Clicks at the end of fades

I’m having a weird issue right now in Nuendo 11, that I have some audio clips that have a fade out in their clip envelope, but they glitch at the end. Even with snap to zero crossings turned on, the audio glitches.

Any ideas?

Is there any offline processing happening on those events ?
Are you using 64 bit processing ?

Are there any plug-ins active on these tracks? If so - do the clicks also happen when they are de-activated (not just bypassed)?