Agro tags don't work with Neutral Mobs that have New AI

EDIT: It appears that the cause leads to the New AI. Wolves already had the New AI before Pigmen did and the bug was only for wolves when this was created, because the anger tag for Pigmen still worked. Since 14w06, the anger tag no longer works for Pigmen, which leads it to the New AI because Jeb made all mobs have the new AI now.

Steps to Reproduce:
1.8/1.7 - type

/summon Wolf ~ ~ ~ {Angry:1}
/summon PigZombie ~ ~ ~ {Anger:1}

[Mojang] Jeb (Jens Bergensten) added a comment - 30/Jul/14 2:08 PM

This has been fixed, but differently for wolves and zombies:

Wolves will only remain angry as long as they have something to attack. Summoning an angry wolf will immediately make it non-angry since it doesn't have a target.

Pig Zombies will actively try to find targets for as long as they're angry, even if they can't find / don't know the source of the anger.