Originally found on a modded version (screenshot of that also attached), but reproducible within vanilla (coordinates available in screenshot).
This is not due to cave generation, as no caves are actually present here.
Untested on oceans with sand floors.
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Quick general feedback: Please, if possible, always copy the seed directly into the description - it just makes it a lot easier to reproduce than having to type out long numbers, thanks π
Can confirm for 20w51 and 1.16.4. I attached this Worldgen Import for easier reproduction. (Water Surface with Floating Islands above)
It doesn't only happen with oceans
This issue is invalid because your game is modified