Bug 1) Charcoal has a higher priority for fuel consumption than Wood. This means that, unless I'm watching the fire and taking them out one-by-one, the Charcoal will get consumed and is near impossible to farm (I'm using Pub Decor/Advanced Arcitechture fires to bypass this at the moment).

Bug 2) Charcoal is not a valid input for the Industrial Forge and yet is required to make Iron Ingots, meaning you have to put Wood in. It's taken a while for my new server to reach sufficient level - suddenly the Industrial Forge isn't Living The Dream of not having to gather fuel. The Description also gives the impression that the 4 Ore + Charcoal is option for additional speed - yet it appears to be mandatory. Iron will not smelt at all unless Charcoal is present.