Create a world in creative with cheats on. Type into chat: /give @p 62. This will give you an active furnace. Notice that the texture in the inventory is wrong in the screenshot below.
MC-9348
Active Furnace has wrong texture when held
Resolved
Duplicate
0
Swiftykitty2K
(Unassigned)
Unconfirmed
active, burning, furnace, held, ignited, lit, texture, visual
Snapshot 13w06a
Retrieved
Duplicate of MC-7133, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.