Underwater effect shows when in 1.5-block tall space under waterlogged block

When in a 1.5 block tall space (achieved by crouching then walking into the space) with a waterlogged block as the roof, the underwater effect will show in the player’s point of view despite the player not being underwater.

This happens in all graphics modes (vibrant visuals, fancy, and simple).

The player does not start drowning in survival mode, so this appears to be a visual bug only.

The intended behaviour is for the view to be the same as if the player was out of water.

How to reproduce

1. Place a bottom slab.

2. Place a waterloggable block above the slab to create a 1.5 block tall space.

3. (Optional) Surround the waterloggable block on its four sides to prevent water from flowing, making the effect easier to see.

4. Crouch and walk into the space.

5. You should now see the underwater effect when in 1st person view.