You have to apply the data pack after the world is generated. Also, I did it in my server.
lol, bug since 1.4.2 and still not fixed.
The ticket is saying to optimize my world, how do I do so? I am running a server.jar from https://mcversions.net/download/21w17a
No, I just loaded my server in 21w16a and 21w17a with data pack.
I used the 21w16a datapack. This is when the bug occurred in my server. Then i used the 21w17a datapack and it was still there.
But, didn't Mojang specify deepslate copper doesn't generate? I know if an ore generates in deepslate and tuff, it becomes deepslate as I mod in Fabric 1.17. But Mojang says it can't happen.