The information for a Smooth Hatch Egg reads: "Smooth Hatches excrete solid Copper as waste and enjoy burrowing into the ground."
That information is only correct if you feed Copper Ore to a Smooth Hatch. Other Hatches only excrete Coal so this is probably a case where the word 'Coal' was just replaced with the word 'Copper'. The information should either list all of the things that a Smooth Hatch excretes or none of them.
Steps to Reproduce
Examine the Information box under the Status tab after clicking on a Smooth Hatch Egg.
This issue has been fixed in either a future version or updated in a previous version.