I am creating a resource pack and I want to change the bottom texture of the pumpkins. But I can't change the texture of the bottom without changing the top. I created a texture identifier (I don't know it name is "identifier") in "terrain_texture.json", then put it in bottom of the pumpkin in "blocks.json" and it doesn't work (only works if change the top texture).

Below, you can see my punpkin bottom texture, the texture identifier, the supposed changed bottom and the top changed.