Rough edges underwater

Seed: 7913388302499728605

Coordinates: /tp @p 1266 28 18597

See attached screenshot. Note the alignment to chunks/half chunks.

21w03a reproduction seed & coords

Seed: -5700764238625076851
Coordinates: /execute in minecraft:overworld run tp @s 5179.49 56.56 -4903.67 222.43 34.66