Is the extension itself doing any kind of live code updating in the scripts? I just assumed there was some automated process that was getting caught on itself somewhere. If not, I'll have to bring it up in the GM Discord and possibly file a bug report when I have more information.
It's unfortunately common enough to happen several times in one dev session, though, so it gets really tedious to re-import the YYMPS every time. I'll start making more git commits to see if I can find any consistencies in why the problem starts.