The opposite of MC-4647.
The bug
For certain graphics cards (NVIDIA ones?) blindness does not work underwater. It only changes the color of the underwater fog but the player can see much further than they can see with blindness on land.
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Comments 7
Can confirm in 20w51a using GeForce GTX 660.

Can confirm on 1.17.1 rc1 with intel, doesn't seem to be hardware specific anymore.
Can confirm 1.17.1 with nvidia RTX 30 series.

Can confirm on 1.18 and 1.18.1 pre-1, correct me if i'm wrong but this is probably affecting all graphics cards now since the GL change in 1.17.
Can confirm in 1.18.
Can confirm in 1.18.1.
Confirmed this issue for 1.16.1
We can see normally with Blindness under water.
We can however, not sprint with the effect on, as is normal with blindness, so the effect only fails to work visually.