I see this tiny pond made for stone and water. It is 6 blocks wide and coral generated on a block.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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It looks like part of that pool is a tropical ocean. Biomes can even be a single X, Z coordinate.
Please state the Expected behavior that makes you think this is a bug.