The Bug
With the recent fog change from spherical to cylindrical, the water fog, lava fog, powder snow fog, void fog and blindness fog effects are also cylindrical
Reproduce
Go in water, lava, powder snow, the void or apply blindness
Notice the fog
Observed Result
The fog in water, lava, powder snow, blindness and the void was cylindrical
Expected Result
It would be like it was in 1.17.1
Can confirm, this also affects void fog and blindness fog.