If you select an item in a stonecutter for the second time, the output turns invisible.

The selected field is still shown as selected, and you can take the item out of the empty output slot.

Steps to reproduce:

1. Open a stonecutter
2. Put and item in (example Stone)
3. Select any version of the item (example: Chiseled Stone Bricks)
4. Select the same version of the item again (example: again Chiseled Stone Bricks)
5. Take the item out of the invisible output slot

For a video demonstration, see the attached video