Anisotropic filtering + mipmap = visual transparency glitch

Far blocks' corners are transparent if anisotropic filtering = 16 and Mipmap levels = 4.

How to reproduce:
1. Dig a 1x1 hole down to bedrock
2. Go up and look down into the hole
3. Set Anisotropic filtering to 16 and Mipmap levels to 4.
Result: You will see blue void at the corners of hole's bottom.