In previous versions, using caves generation for buffet, village paths would be above the bedrock ceiling. In this snapshot, the entire village is above the bedrock ceiling.
Steps
Create New World
More World Options...
World Type: Caves
Customize
Biome: Plains
Expected
Villages generate around y=64 (based on terrain)
Actual
Villages generate at y=128, above the bedrock ceiling
Bedrock is replaced by structure
Players can gain access to the bedrock ceiling in certain areas
Attachments
Comments 3
The following spawns on top of the bedrock roof in cave worlds:
fortress
igloo
jungle_pyramid
mansion
ocean_ruin
pillager_outpost
ruined_portal
shipwreck
swamp_hut
village
There are exceptions:
buried_treasure - chest will spawn just below the bedrock ceiling
fortress - does not spawn at all
All of this applies to both when minecraft:caves and mincraft:nether is used for world generation.
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To confirm, this still happens with the new world generation JSON when you use the "caves" generator settings. In 1.15 and early 1.16 snapshots most structures generated under the roof.