JackTapper

myself, mack and syrvius placed ore in the larger furnace. All of us have vip. The furnace would not start without wood, with wood in the furnace with the ore it would be consumed as if normally used. Methods tried was to right click ore into large furnace without wood in inv and place ore individually into furnace. Both instances without wood with vip we could not get the furnace to turn on. 

Also impacting large furnace, just tested.

just spoke with roflnator he is still having the issue for 2 days now. When he dies if an item drops on the ground it also disappears. He has no clue on how it started or what he was doing when it did.

its random, unable to reliably reproduce this witnessed the bug happening to 3 different players.

to add to this charcoal is created if its only wood in the furnace. Not if other items are being smelted.