Zombie Pigmen as well as spiders don´t react to oter mobs´ attacks(tested w/snow golems)
Also, Endermen don´t seem to be teleporting out of water.
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is duplicated by 1
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Pic: Spiders also turn on themselves
Spiders are completely bugged in 07a. They can't move in water anymore and they still turn on themselves sometimes!
Spiders turning on themselves is actually kind of cool. Like mantises eating each other when they're babies.
Confirmed for 14w10c. Plus, this ticket needs to be updated.
Fixed in 14w11b for spiders that turn on themselves in water and in 14w07a/8a for endermen that don't teleport themselves out of water.
Confirmed in 14w17a for zombie pigmen that don't react to Snow Golem attacks.
Confirmed for 14w19a.
I know what causes this. So simple, honestly. The mobs with the old AI system of pathfinding automatically attacked any mob they were hit by. Remember in beta, the zombies were attacking back before the new AI? Same exact issue.
Confirmed for 14w25b.

Confirmed in 1.8 for zombie pigmen not reacting to other mobs attacks.
confirmed for 1.8.1 pre-3
Confirmed in 1.8.1-pre4
Also related, but not entirely the same, as MC-69032 as mentioned by Sonicwave
can confirm in 15w45a spiders and pigmen don't react to snow golems.

Can't reproduce in 16w38a
What about 1.10.2 or earlier versions?

Confirm for 1.8 (but can't confirm the enderman bug), fixed for 1.10.2
Confirmed. And duplicated by my report MC-47933, sorry. Is it possible to add that spiders sometimes turn on themselves in the water and don't attack the player (they have a strange behavior) ?