The changes in visibility in water introduced in snapshot 18w10a doesn´t apply to all ocean variants; the background/fog color is exactly the same for frozen ocean, cold ocean and normal ocean. I expected to see differences according to the temperature of the water.
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Confirmed for 20w12a
Can confirm for 18w19b. This only applies to oceans that are colder than the "normal" ocean. Water fog in cold and frozen oceans is not indigo even though the surface of the water in those biomes is that color, which is inconsistent.