Cut Copper blocks duplication by using Stonecutter instead of Craftting Table

Probably this bug appeared since 1.17 when copper was added.

I craft cut copper block by putting 4 blocks of copper in crafting table and get 4 cut blocks Right?

But when i put 1 copper block in stonecutter, i can get 4 cut blocks

I can duplicate cut copper blocks by cutting them in stonecutter instead of Crafting table