The mesas in the 'Bryce mesa' biome variant will generate on top of any rivers or lakes, floating directly above the water. This issue has been present since their first appearance in 0.9.5.
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What is your seed?

Images are shown of the seeds 'shroomzy' and '1424647132'.
Thank you
Confirmed on Galaxy Note 3. Android 4.4.2
Relates to MC-30560