Zombies breaking random doors.

Unexpected Behavior:

Zombies tear down random doors, even though there is absolutely nothing behind them.

Expected Behavior:

Zombies should only break doors that their target has recently gone through, or if they sense a target behind the door (villagers, players)

Steps to Reproduce:

1. Build several small buildings with a door entrance.
2. Spawn several zombies.
3. Notice that they break the doors. Make sure you are in creative so that they do not target you.