With the new 'Caves' world generation came a huge bug. I think all structures generate on top of the bedrock roof. I've seen lakes, villages, and even those newer nether portal natural generations.
Environment
Windows 10, Java version 8, build 1.8.0
MC-191408
Structure generation on top of bedrock roof (new caves world generation)
Resolved
Duplicate
0
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However, we are already tracking this issue, and this report is a Duplicate of MC-129235, which is a report that has not been resolved yet.
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