The furnace won't let me put cole and I have to break the furnace to take my stuff

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
I expected to take my stuff out of the furnace !
What actually happened was...:
Describe what happened here
I couldn't put cole or take back any iron or gold
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...I was thinking I can take my stuff out of the furnace
3. ...