Put the summary of the bug you're having here

*What I expected to happen was to be able to smelt iron
Describe what you thought should happen here should fix the furnace.

*What actually happened was couldn't put in fuel would not let me tap the bottom slot
Describe what happened here
Couldn't put in coal cause it wouldn't let me tap the bottom slot
Steps to Reproduce:
1.fix the furnace
2. ...
3. ...