I'm sure this is not the only issue with terrain generation but on this seed: -782435656790528130 there is a patch of floating sand in the air at cordinates: -116 71 544
It seems obvious this is not meant to happen.
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We're tracking this issue in MC-30607, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate of MC-30607, which was later resolved as "Works As Intended".