Not necessarily a bug, but it can get very annoying. I came across an igloo, after generating new chunks in a world I created in 1.8. I found an igloo, and the chests and furnace were completing gone. The igloo was left open, with a tiny pond next to it ruining the generation. The only thing in there was a bed and ice. Not sure if this is normal, or a one off seed problem, but I was highly annoyed that loot was destoryed because of a bit of water!