Thanks for letting me know! The save-file crashing was a known issue that I thought I had fixed... The fact that the morning's autosave also broke is confusing, but I'll look into it! Anything else that happened before you saved if you can remember would also help
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Encountered the same error after restarting, the morning after first going to the church at night, in Semester 3 with Anya's relationship level maxed. Also, again lost access to all potion crafting after looking at the ingredient list. Have a save from right before that I can do some repro work with