Hey, thanks for your comment!
The favorites thing is a quirk of the framework we use (HISE). It saves your favorited presets periodically, and then again when you close the plugin or DAW. If the DAW closed unexpectedly, then it's likely the plugin didn't get the chance to save properly.
As for the crash, I'm not entirely sure. I wonder if it has something to do with the recent updates to how Mac handles C++, but I'd only be speculating. Did Cubase or your system save a crash log that you could share?
I'd like to troubleshoot the crash together before going any further, if that's alright.