A furnace doesn't just output cold usable results. You need to wait for them to cool down.
Mods introducing new content into the game.
Furnaces, assembling machines, production chains.
When using AAI industries, the first tech is a trigger tech "Burner Mechanics" that is triggered by crafting copper plates. It's not changed to hot copper plates. Screenshot: https://imgur.com/a/5uvb0Mc
I just realized I was mistaken. It is triggered by hot iron plates, but I couldn't tell the icons apart.
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