I found a bunch of clay blocks deep underground and I thought "I'm going to blow this place up until I find moss etc" and I couldn't find anything and instead an underwater cave with lots of tropical fish
Seed: -9061546258221790320
Coordinate: -669 2 6840
Thank you for your report!
However, this issue is Working as Intended.
The report you have submitted is working as intended: A flooded cave can generate anywhere underground, even in lush cave biome.
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Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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