[35.10][BG] Issues with planetar and fiends AI

[Anterwaare]

I have encountered multiple instances of planetars and fiends behaving in unusual ways. In case of planetar it sometimes auto-casts heal on the enemies in combat. In case of fiends they sometimes fight each other, even with the party in their visual range. I didn't notice those issues in a 35.0 run. Examples:

planetar heal: 

fiends fighting: https://youtu.be/ylAEvWqLt_c?si=knCQZcvaM-qjFoil&t=2297

weidu: https://pastebin.com/vCybphEB

[DavidW]

Missed this one first time around but saw it flagged in Discord.

I can see what's going on with planetars; fixed locally, will be in 35.18. Can't immediately see what's causing the Fiend issue; will try to reproduce when I get a chance but might not make it into 35.18.