I'm probably not the only person who hasn't benefited from the 'new' ish mining system. Having to dig down to deepslate and then mine endless deepslate is quite the pain. SO! No more will that be a problem! With some luck, anything is possible!
Select version for changelog:
Fixed a minor bug where you cannot mine copper ore with the new pickaxe. (By the way, the pickaxe doesn't affect copper, lapis, or redstone, so you shouldn't really use it on them anyway)