Whenever the player stands in water, with the light level being something noticeable (8 to 0 or so), the surrounding light level in the world, including the water, gets gradually brighter. It's as if the shading for being inside a block were reversed only for water. I tried teleporting myself into a block, where my head and torso would be free, but the shading was correct.
This also happens at night, but I only have an example for one at day: https://www.dropbox.com/s/wn42bcd037m7t00/Water%20Shading%20Reverse.mp4?dl=0
After reading 18w08b 40 minutes later: oh...well it shouldn't work above water anyway.
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Yeah, I know that, but the shading for being in the water works for seeing the rest of the world if you were to bob in the water.
I made the video thinking the lighting itself was a bug, but then I read the snapshot on minecraft.net and realized it was only supposed to work in the water. Since the video shows both above and in the water, I left it there.
The shading gets brighter the longer you're in the water. This is to replace the fact that water breathing potions allow you to see clearer.