Pigs unable to move through fence gate

Put the summary of the bug you're having here

What I expected to happen was...:
Two pigs move one by one through a fence gate towards a player holding a carrot

What actually happened was...:
The pigs remain where they are and just converge/diverge continuously

Steps to Reproduce:
1. create a fenced enclosure containing a fence gate
2. Open gate while holding a carrot