I guess this is a know problem and Aikar is already working on it, but since a quick search of the forums didn't give me any results I'm posting it. If it's a duplicate please ignore it.I was making a tunnel on the nether when the animal update happened, and suddently my tunnel was overrun with pigmen (lots of gold to me), and the sounds of a lot of ghasts outside. I didn't go out for fear of ghasts and continue working on the tunnel.What seemed weird to me was that the ghast suddently started shooting. At first I thought a supporter was ouside, fighting, since my tunnel was completely sealed, and none was visible on the live map. But suddently the floor of my tunnel exploded, with a very long hole made by a ghast that manage to demolish more than 20 layers of netherrack to get at me.