AI villagers not retreating into houses at night.
The result: whole village wiped out by zombies on hard difficulty. This also happens inside the village when the villagers are standing near the doors. Keep in mind that these are not player-made houses. This problem happens in naturally spawning villages. I loaded up three worlds to test this, and the result is the same every time. This didn't happen in 1.3.2.
Ignore this post. This AI villager bug was a Forge problem and has been fixed.