ancientwarfare-1.12.2-2.7.0.1038
betteranimalsplus-1.12.2-9.0.1

Sorry if my English is not very good.
I recently ran into a nasty problem with my modpack. Sometimes friendly mobs start attacking the air and nothing can stop it.
Finally I found the source of the problem. For some reason, the mobs can see the Hirschgeist despite the fact that it is completely invisible and has not appeared in the world. I think this is due to the fact that the Better Animals Plus uses some strange method of spawning the Hirschgeist.

Steps to Reproduce

1. Run AW with Better Animals Plus
2. Find a structure where mobs will attack the air. This doesn't happen very often and you need biomes where the Hirschgeist can spawn.
3. After you have found such mobs сlose the game and delete "betteranimalsplus:hirschgeist" from target_lists.json/hostile. After that, the mobs will stop attacking the air.
4. Add the "betteranimalsplus:hirschgeist" to the target_lists.json/hostile again and restart the game. Mobs will attack the empty space again.

Possible Solution

1. Delete "betteranimalsplus:hirschgeist" from target_lists.json/hostile

Nice find. Will delete that entity from target lists