Like you see on the screenshot, the villagers don't recognize "invalid" houses with blocked doors:
Adult villager:
They should ignore these invalid houses
Currently they seem to run to the North(-Z)-West(-X) corner of the houseBaby villager:
Some of them get by accident inside, but they don't really understand how to get in, even it is possible for them
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Similarly, if a house is built floating above Villagers, they will try to get to it, even though they can't even get close. Tested in 15w50a
Well, where's the screenshot?