When above tall grass, it starts flickering if you have mipmap disabled.
(Also, when you turn mipmap on, the blocks become weird for a second - with only one color, like Cube World).

Steps to Reproduce:
1. Open a world with tall grass
2. Turn off mipmap
3. Fly above the tall grass
4. Look at the sky and slowly start to look down

Video Proof:
https://www.youtube.com/watch?v=rwysIocmyBw