In villages, small houses (5x5 houses) and blacksmiths generate without doors. This means they are not technically houses and therefore lowers the chance that villagers will naturally breed and spawn an iron golem. In fact, I have never seen a naturally spawned iron golem.
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I thought small houses normally spawned a few short of a door, and I understood that as "works as intended". One of the first things my wife and I do on finding a town is look for these to put doors in. If this is a bug, this has been around a while.
The blacksmith house not having a door is kinda a bugfix, because game wise is the house reversed, becaust the area at the forge is treated as "inside". If the blacksmith house would have a door, then the villagers would stay there at night.
The small houses, looks like a valid bug.