Why are NPC houses halfway built?
So I just spawned a new, singleplayer, creative, peaceful world. I looked for an NPC village, and hurrah! After ten seconds, I found one. However, when I came down (I was flying) I noticed how a house looked halfway built. I thought some of the chunks haven't loaded in yet, but it did fully load in! I could even go inside! There were two other houses with the problem. I took two screenshots.
Best Answer
The Simple Answer: Because minecraft unsuccessfully loaded that chunk:
The Complex Answer: Minecraft stores "chunks" in a file which gets bigger as you move around, exploring more chunks. In this case, Minecraft didn't manage to load that chunk therefore left it and applied the default to it (Without the village: the plain flatland).
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terraria logic - NPC housing
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Answer 2
Most likely a generation error.
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Images: Max Vakhtbovych, Max Vakhtbovych, Max Vakhtbovych, Max Vakhtbovych