Seed: 3854556177424684123
Coordinates: -90 30 624
See attached screenshots.
Another one: Seed: 6681878277208838608 /tp @p -1189.5 67.0 3950.5
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No longer occurs at both locations.
18w43b:
Seed: -5863895513777108296
/execute in minecraft:overworld run tp @s 187.55 38.09 -92.98 -30.50 47.99

this also affects 18w43c

Can confirm this is happening in 18w43c. Screenshots below show this bug.
[media][media]
Can confirm in 18w43c. Seed: -8300275442758179407
[media]Can confirm in 20w49a.
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w05a.

This ticket should be closed because underwater ravines are removed in 21w06a. They reimplemented underwater ravines in 21w15a.

I am unable to reproduce this issue in 1.17.