Villagers will attempt to climb ladders but get stuck on hatches. If I open/destroy the hatches they will climb the ladders but get stuck on that floor of the building. The only way to get the villagers down is to destroy the ladders (If I don't, they will just climb the ladders again and get stuck.)
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Duplicate of MC-114007
Can confirm it has happened to me as well. I've even had two villagers trapped at the top of the same ladder. They somehow keep ending up at the top of the same ladder even though it is out of the way of the village (up several staircases in a house at the edge of the village, with no points of interest up the ladder).