I just found that grass textures affect hoppers (goes trough hoppers) in 1.7.10 (it does not let me use 1.7.10 so i will just use 1.8.8). I just was in my modded world and i was playing, doing some stuff and other things like redstone... and i found it.
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Thanks Sonic
No problem. 😉
Unfixable per MC-19005