Thanks for replying!! I'll keep an eye on both of these to see if they pop up in any of my tests going forward.
If the second error was indeed caused by rollback, I'm not surprised you can't recreate it. There was a weird game-crashing error related to rollback that I experienced during the development of Gilded Shadows and it could never be recreated consistently in the same place with the same actions. We had to eventually chaulk it up to something with Ren'py and move on because it didn't seem to be related to my code specifically.
But hey, I get to mark 'mysterious error' off my indie dev bingo card in my journal! A silver lining! 🤣🤣🤣