You can creative a world whose the "World Type" is "Floating Islangs", and go down to the low Y position, you can see there are many exposed rocks, like many floating "cave"
MC-215072
There are many exposed rocks at low Y position when the "World Type" is "Floating Islangs"
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We're tracking this issue in MC-208816, so this ticket is being resolved and linked as a duplicate.
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