No caves under y=0

Duplicate of MC-239845 which was later resolved as "Invalid". Please see this comment by @unknown for an explanation as to why. 🙂

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We're tracking this issue in MC-239845, so this ticket is being resolved and linked as a duplicate.

That ticket has already been resolved as invalid. Please take a look at the parent ticket (MC-239845) and see if an explanation is provided there in the description of the ticket or in the comments for why this issue is invalid.

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