Stonecutter can convert 1 Copper Block into 4 Cut Copper Blocks / 8 Cut Copper Slabs

Using a stonecutter in 1.18 and 1.18.1-pre1 to convert a copper block into Cut Copper will output 4 Cut Copper Blocks instead of the expected 1, or 8 Cut Copper Slabs instead of the expected 2.

I suspect this happens because of this crafting recipe being handled incorrectly when converting to the stonecutter.