Bug
Dripstone caves above y=0 generate copious amounts of copper ore, making it the best biome to obtain it in mass quantities, similar to badlands gold. However, dripstone caves below y=0 do not generate any copper at all, which defeats the purpose of going there to gather copper.
Reproduce
Seed: 9030307658990181730
Coordinates: 4528 / -19 / 483265
Expected Result
Dripstone caves generate copper ore at any height, because that is one of its main features.
(Note: Blobs of copper ore generate within the stone to deepslate transition layers, but not beneath)
Dripstone caves don't generate an excessive amount of Copper Ore like how Badlands does with gold but instead increases the pre-existing copper ore blobs to be bigger. See the 1.18 experimental snapshot 4 changelog for more information.