Put the summary of the bug you're having here
What I expected to happen was bone blocks and coal ore to generate in walls for cave generation in swamps
What actually happened was bone blocks and coal ore were generating in mid-air
Steps to Reproduce:
1. Search underground in a swamp biome in spectator mode
2. Travel around for a few minutes
3. Before long you would have found the bug
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We're tracking this issue in MC-214784, so this ticket is being resolved and linked as a duplicate.
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