@squarpadmin, the thing I was talking about is pretty well covered in topic I linked earlier. It’s not specific to the beta, I know I’ve seen the phenomen on v2.30 but don’t have a reproducer at hand and couldn’t create one yesterday when I briefly tried to.
That said, there are clearly several different issues being talked about in this topic. And while checking the sounds of a newly acquired expansion board for my JV-1080 today, I realized that on some patches have a very noticeable loading time, probably closer to half a second worst case. The behavior is such that if you select a new patch and then quickly hit a note, the note will start playing after the load has completed but a 1/8 or 1/4 note could easily get lost in there. And that wouldn’t happen on the next loop of course because the patch is already loaded. However I don’t remember seeing missed notes with step-entered data so … I dunno. I’ll keep an eye on it and investigate closer if/when it happens next time.