Under water texture under block

What I expected to happen was...:
the water texture don't appear under blocks

What actually happened was...:
When you are under water, the water top texture shows of when there is a block that is air in the 9 block on top of the water, and don't if there are all 9 that aren't air.

Steps to Reproduce:
1. go to a water lake
2. (take night_vision to see something)
3. cover the lake with blocks (like stone, dirt, ...)
4. go in the water