Although it said recently it was fixed for them falling through wood blocks, I'm still seeing villagers (and even some other mobs) falling through blocks as they're walking. It doesn't happen too much, but just enough to make it annoying.
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This is a separate issue to the falling through blocks one. This one is purely visual and they snap back up after some time.

Yeah but still, it's not supposed to happen

And that's why the bug is still open and valid. I was just pointing out that's it separate from the one that we fixed 😛

Alright! Thanks Dinnerbone

Bug happening in 1.4.3 pre release multiplayer server :
As Dinnerbone said , villagers have a visual glitch when moving, falling into blocks but still be at the right place when starting moving again
It's not just Villagers... I also saw a zombie falling through the ground (cobblestone) when trying to break into my house
EDIT: I can confirm: http://puu.sh/1iyK9.png