A Zombie walked right past the Golem without the Golem twitching. The zombie proceeded to hunt all the villagers also caught in the water flow, so I had to kill it.
Shouldn't it be fixed, though? Iron Golems are supposed to target hostile mobs, but being hit by a Snow Golem causes it to hunt the Snow Golem for eternity (unless the Snow Golem is within reach), making the Iron Golem a statue.
I thought Mojang decided not to do this. If I remember correctly, they were originally going to do this, but decided not to. I'm probably wrong, however.