Put the summary of the bug you're having here

What I expected to happen was...:
The Iron Golem would attack the skeleton that was near the village

What actually happened was...:
It did nothing at first while the skeleton shot at it, until i pushed the skeleton over to it, where it then attack (but only when it was a few pixels away - less than a block length).

Steps to Reproduce:
1. Put into nighttime
2. Make Iron Golem
3. Watch as it does nothing to actively protect the villagers.