There have been weird bits of generation in the new cave update for 1.17. This occurs mainly in underwater caves but sometimes in the normal caves. I suspect its to do with something on how the caves split, that or chunk issues.
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It would help a bunch if you gave yourself nigh vision. You can give yourself the effect like this
/effect give @s minecraft:night_vision 600 1 true
The last three pictures are called cracks which are added in 21w08a, they can be up to 90 blocks deep.
Thank you for your report!
We're tracking this issue in MC-216795, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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They are extremely bad pictures, but I have the seed in chat and you can teleport to my coordinates.