is setTarget(LivingEntity) broken?

Simple question: is setTarget(LivingEntity) broken?

 

Simple answer: yes!

Since the new pathfinding AI, the setTarget() method does no longer work in most situations.
There are some mobs which still don't use the new pathfinding (Pigzombies and Blazes(?) I believe.).
But most of them do.
From what I can say, changing the target of an entity that has already targeted something is very unlikely to work.
I don't know how to manipulate the target of an entity reliably now.

Using a creatures "navigation" to get it to go somewhere seems to be possible. But things like "don't attack that entity anymore" or "follow that player" are a problem now.

 

Yeah, you're right, pigzombie does work, thanks

When should this be fixed?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.