Inconsistent monster alignment
Non-neutral monsters (can) become neutral
While I had assumed that harpies are (always) chaotic, I decided to test this further after losing a character to a sacrifice by a harpy on a neutral altar.
In my tests - which can be reproduced from the attached svg by wishing for a harpy and casting Know Alignment on it - I found that harpies are sometimes generated chaotic, other times generated neutral. Sometimes, one that was generated chaotic then turned neutral...!
I'm guessing alignment variation shouldn't occur... unless monsters now think and reflect as individuals...?
EDIT: Any monster tested - chaotic or lawful - switched to neutral alignment when they became hostile. This certainly seems like a bug.