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Aggressive neutral mobs become neutral when the world is reloaded

Endermen won't turn hostile when shot with arrows and other projectiles

Neutral Mobs Can Damage Player in Peaceful Difficulty

Llamas try to spit on pufferfish after getting hurt by them

Endermen stop moving, if you look at their face even when they're already in hostile mode

Drowned do not attack nor burn outside water. They become neutral.

Endermen that have been turned hostile by other means than looking at them will turn neutral when looked at

Endermen don't often teleport instantly when they fall into water

Spiders are slow to respond when attacked during daytime

Neutral Mobs don't attack the player back when attacked under certain conditions