I found this early in my game. Its a fuling village in the plains right next to a dragur village in the meadows. When I come into view of it multiple fulings and multiple dragur spawn and then they fight it out. No new fulings spawn but the body piles in the dragur village do spawn new dragur. Once all the fulings area dead the dragur head back to their own village they don't attack the fuling buildings. I can just walk through at that point and pick up tons of entrails and 6 or 7 black metal scrap. Any dragur will attack but every fuling is all ready dead.

Every 3 game days I can go back and new fulings will spawn but if I go back before that time has passed no new ones spawn there until that 3 game days has passed.
https://steamcommunity.com/sharedfiles/filedetails/?id=2846928091