Mob healing

[Wayward]

I haven't played in a while, but last time I did - I remember that there was a mechanic that mobs would not heal themselves unless someone was in melee range. Does this also apply to other mobs surrounding them?

Necros who have done Felwithe live by this mechanic working, so I'm confused as to why goblins in Droga still heal themselves despite nobody being in melee range. (And they also get healed by others)

Can anyone confirm this mechanic and how it's supposed to work?