I generated two fresh survival world's in a row, both with the experimental "Caves and Cliffs" toggle enabled, and both times it spawned me in a shallow riverbed where I lost half of my health before even loading in. For obvious reasons, this is an issue.
Steps to replicate: 1) go to Create New world
2) enable "Caves and Cliffs experimental toggle
3) Create the world
4) Die
This might not have guaranteed results but it happened twice in a row for me so it's not too uncommon.
Related issues
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I have not noticed the issue since the release of 1.17.0 but I also haven't been on the betas recently and it was an issue with the "Caves and Cliffs" experimental toggle, so I can't say for certain.

Thank you for your report!
We're tracking this issue in MCPE-120237, so this ticket is being resolved and linked as a duplicate.
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Is this still an issue in the latest version? If so, can you please add it to the affected versions (or mention it if you are not the reporter).
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