Issue Description

When smelting thorium ore inside of a vanilla minecraft furnace, once an ingot is done processing, another one will not start processing until the first ingot is removed as they do not seem to stack inside the furnace. As soon as the ingots are moved into a different inventory however, they stack like normally.

Modpack version (Do not use "latest")

1.4.9a

Logs

No crash report available as the issue is not related to crashing.

Screenshots

Additional context

I have no idea how to fix this :P

Can confirm. tomdodd4598/NuclearCraft#455