On world generation, generated villages may be placed above tunnels which can cause the gravel roads to sink underground. This may result in villagers being trapped in caves and unable to get up. Happened in the Plains biome.
Seed: 3546009778691708063
Coordinates: 788, 64 ,216
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Comments 2
Fixed in upcoming 1.8.
http://minecraft.gamepedia.com/1.8
(world generation, cobblestone added under roads to prevent collapse in caves)
Example.