[RRQE] 'Never Scared' moodlet despite not unlocking Scare Seeker Lot Challenge

I've identified the cause of this issue: The Master of Grudges aspiration (a reward from the Lost Legacies event) is the culprit.

If you  even have this selected as an aspiration on any Sim (completion isn't necessary), that Sim will eventually begin getting the Never Scared bored moodlet. They won't start seeing it immediately.  Takes around five in-game days to kick in, but once it does, the moodlet will pop up fairly frequently.

This aspiration is supposed to carry the dastardly bonus trait, but the field is blank in the CAS. I believe it was mistakenly attached to whatever hidden trait causes the bored moodlet from the Scare Seeker lot trait instead of dastardly.