Put the summary of the bug you're having here

What I expected to happen was...: to get my iron out to make a bucket
Describe what you thought should happen here

What actually happened was...: the furnace would not let me get items out but put items into it
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...go to furnace
3. ...try to cook/ smelt items