I have this exact same problem. The leaves and effects, when slightly distant, become these ugly square flat sprites. Turning off mipmap/antialiasing/anisotropic filtering did not solve it. Is there a solution?
Please help, I downloaded a better foliage and stumbled upon such a problem that with the Pixel perfection resource pack the leaves with the mod become not under the gamma leaf, just such foliage as birch and dark oak, help me please, the example below will be very grateful[/pre]