Put the summary of the bug you're having here
You can put the thing to smelt into the furnace however you can't put coal in or take the item out without breaking the furnace.
What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...