Unable to load fuel into a furnace

When going to smelt anything in a furnace, you are unable to swich to the fuel block. this makes it unable to smelt anything.

I wanted to smelt iron ore in a furnace, but i couldnt swich to the fuel box.
I thought i should be able to add fuel

the furnace would not swich to the fuel box

Steps to Reproduce:
1. Craft a furnace
2. load a block that you want to smelt
3. Try to swich to add fuel by pressing on the fuel box