Describe the bug
Copper Dust is missing the tag forge:dusts/copper and forge:dusts

To Reproduce
N/A

I hope it's okay I deleted the rest of the fields :P

Do other metal dusts from occultism work for you? Copper is set up and linked to forge:dusts as well

Nope, Silver/Iron/Copper Dusts aren't in their respective dust tags according to my game. I do see them in your datapack though, so it's probably something on my end, sorry for the trouble :)

Follwup: I was indeed doing something stupid, I was replacing the forge dust tags with my own ^^'