Snowy grass, mycelium and podzol blocks are not randomly rotated, even though their normal variants are

This causes their bottom faces to appear unnaturally orderly, as well as cause them to rotate by themselves when snow is added or removed from them.

A resource pack that fixes this as well as MC-1483 can be found attached to this ticket. Mojang have my full consent in directly implementing these assets into the game with or without making any further changes.