I'm trying to change the top and bottom of the copper blocks for my texture pack, but when i try to, it shows the missing texture.

This doesnt make sense since i have all the required fields met for the textures to change in the first place.

This works on the other ore blocks but I'm pretty sure it doesnt work on a very large amount of blocks since I had the same issue with the Haybale.

Heres a link to the texture pack

https://www.mediafire.com/file/dy9kh7gvx0bae4x/ClassiCraft.mcpack/file