Sorry for the long response. Life happens, y'know.
I'm afraid I didn't quite have enough info to repro this, but I had a hunch what was causing it between looking at Yanfly's code and my own. As such, I have a possible fix, but I can't 100% guarantee this one. (Actually, if I'm right, the error isn't far off from what caused the last one.)
All good, I was pretty confident that you'd respond one day :D
I can also keep trying to reproduce the error while recording, which may give a little more insight.
And yeah, it may not seem that far off from last time, since the game supposedly crashes once a character
makes their move after the one causing the issue. Thanks a lot for your time!
EDIT: I may have a hunch here. I got it to reproduce several times now.
HOWEVER: This only happens when Rubberbanding in the CTB settings is OFF. I haven't encountered the bug once
after rubberbanding was switched back on.
Here's still another video:
