Talk:Update 1.1/@comment-25120690-20170214211725/@comment-28905095-20170219165154

You can put all flammable objects directly into the Input slot, i.e Shovel, Fences, Slabs, Stairs, and so on. If you are using an automated station with a Hopper above the Furnace, you can really put anything into the Input slot by putting anything into the Hopper.

Whether this is a bug or not, is not up to me to decide, but I've seen this behavior for quite some time.