I apologize if I'm chasing the wrong direction with this, but I've been fighting irregular but frequent CTD on save behavior for about a week now. I finally found meh's .net script framework SKSE plugin, and its crash log notes a few registers like this:
CX: 0x24FF220C0BA (char*) " Skyrim Special Edition Patch.esp"
DX: 0x24FF220C0BE (char*) "rim Special Edition Patch.esp"
I'd think that must refer to the Unofficial patch but I'm at a loss on how to debug further to determine if that really is the issue or not. The full log is attached if that's helpful.