Grass side item bug

Grass blocks (in inventory and as drops) do not show grass_side_overlay.png (found in /textures/blocks) on them. I made a texture pack, I thought that the grass overlay on grass_side.png (also found in /textures/blocks) wasn't necessary. I made the grass_side without the grass, and this was the result! This also happens WITH THE BLOCK ITSELF when your graphics at set at "Fast". In the attachment I added: How it looks, my grass_side.png and my grass_side_overlay.png.