Issue Description:

If furnace is smelting, i can see the arrow and blank spaces instead input item and output item.

Steps to reproduce:

1. Place a furnace.
2. Put fuel and smelting item.
3. Look at furnace.
   ...

Affected Versions (Do not use "latest"):

• Hwyla: 1.8.23-B38
• Minecraft: 1.12.2
• Forge: 14.23.1.2555

i have the same issue with using:

• Hwyla-1.8.26-B41_1.12.2

• minecraft 1.12.2

• forge 14.23.4.2705

the furnace wont display what is being smelted.