Talk:Update 0.9.0/@comment-5139023-20140704041723/@comment-5139023-20140709155347

Aha! I found the cause! Mistakenly, the game would think the charcoal is actually coal, stacking it into a stack of either a 44 or 64 stack or coal/charcoal, breaking the "64 max stack" rule.

This also happens when you convert Charcoal into Coal, how is obvious, Charcoal and Coal seem to have the same Item IDs (I can't tell you if I'm right, as I can't check), only differentiating in graphics. I can put Coal into a Furnace and then put Charcoal into it, solidifying my idea that these two might possibly have the same Item ID. So I have to either empty my inventory of fuel, or put in the stack that won't cause the fuel in the furnace to go above 64 in order to not crash.

Understand all of that or do you need a walkthrough?