The bug:

I noticed that Copper Blocks and Cut Copper Blocks can't be used on a Stonecutter.

What I expected to happen:

That those could be used there, like Quartz.

What actually happened:

They couldn't be used there.

My comment:

That's inconsistent with stone-related blocks that can be cut. Quartz Blocks also can be cut on a Stonecutter, so minerals can be also cut.

Thanks for seeing this.