This is what I found.....In the latest beta this all occurred naturally
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Duplicate of MCPE-139665
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After experiencing bug MCPE-139680, a newly created world is affected by this problem with Cliffs and caves toggle turned on.
This problem might be a failure on loading an existing saving, because the first time I get there everything is just fine. In addition, it persists when another world is created with experimental features turned on only.