Villagers won't go through Nether Portal

What I expected to happen was...:
I pushed a Villager into the Nether, now that I want to bring it back he won't teleport.
What actually happened was...:
He did not. He is IN the portal but he will not teleport to the overworld. Several minutes have passed and I've tried closing and reopening the game.

Steps to Reproduce:
1. Teleport a Villager to the Nether
2. Try to teleport it back to the Overworld (The portals were 180 blocks apart)