Even though the target pool is directed at village buildings, streets can randomly generate from the other side of the block.
/setblock ~ ~ ~ minecraft:jigsaw[orientation=north_up]{name:"minecraft:building_entrance",pool:"minecraft:village/plains/houses",final_state:"minecraft:structure_void",target:"minecraft:building_entrance"}
set generation level above 1
I noticed this almost always happens when the block is placed on top of trees, for some reason.
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This is not a duplicate of MC-187131. The tree has nothing to do with the bug. The reason this happens is because the jigsaws on the front of the houses are targeted to the streets pool, even though it's unneeded since the streets are targeting the houses. I just noted that it seems to occur more often on top of trees. If anything, they are related.
Okay so I tried recreating this bug in 1.16.2 and it's practically impossible to get the bug to appear, tree or no tree. It looks like it might be resolved.
Duplicate of MC-187131