Also the one in the image wasn't broken when I got it, it broke at some point afterwards.
Viewing post in The Case of the Dungeon Descent comments
Thank you someone1065 for the details! I've been looking at this and I still never figured out how this happens. 🤔
What I did instead was fix up the fate tester code to be more robust overall. I'm hoping this will squash any remaining bugs. It can also recover from a bad state that got previously saved now (the player might have to re-enter or re-check some fates.)