when I made a cave only world, there were villages and ruined portals spawning above bedrock.
How to replicate:
1. load Minecraft
2. make a caves only world with cheats on
3. go into spectator mode and go above bedrock
4. look for villages and other things
MC-210763
Villages spawn above bedrock in caves only worlds
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This appears to be a duplicate of MC-129235, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.