I am not sure what to make of this enchanted grass tile, it seems like there are two sets of grass textures with just one being moved by the wind in the GLSL shader.
The grey-ish grass (below the cart wheel centre) and black sticks (just in front and behind horse's hocks) become visible every time the wind blows and the grass waves.
I've never seen it on enchanted grass before.
At first I thought it was the grass texture coming across from the rock tiles, but he whole enchanted grass tile seems to be affected, not just the edges.
The tile is 1007, 1942 on Deliverance Community Map