Furnace stops working for no reason

Why do furnaces stop working at that state now?

Normally they used to use all slots and the 10k stack size completely until they stopped cause there was no more room.

But here's plenty of room for more metal frags and charcoal but the furnace goes out.

charcoal is set to only get added into slot 1, Looking at the image, I would guess your charcoal stacksize is set to 10K which means its full and cant smelt any more. You will need to remove the charcoal or set ignore stacksizes in the output to true

Changed Status from Pending to Not a Bug

Changed Fixed In to 2.1.9

Thx for that hint with ignoring stack sizes.

Is it possible to have it work like default, when one output stack is full it switches automatically to another empty stack and starts filling that one up?

It's doing the same thing not only for Charcoal in furnaces, but also Low Grade in the Oil refinery.

Thanks

I was avoiding that as it adds additional overhead you can get around by ignoring the output stack sizes. 

Next time I am making patches I can look at what sort of a hit and lift that would be however.

Thanks a lot, that's great!

Changed Status from Not a Bug to Closed

Changed Fixed In from 2.1.9 to 2.2.0