When pickpocketing Nadene Drin after paying the 500 gold debt off just outside of the Imperial Commission, an error prompt says "ArrowBone missing on actor "TR_m4_q_NadeneDrin00000000". Attaching a picture. It seems likely that this is triggered on aggression, possibly specifically after the debt is paid, so maybe once the debt is paid a script is stopped so it is no longer giving her ammunition?