The furnace texture in the player's inventory has no face, as in the texture that lights up when in use is nonexistent in the picture in the inventory. As the changelog listed using individual texture files for blocks and such, this may be an unintended result.
Environment
Using multimc to launch Minecraft in windows 7. I do not believe that using multimc is relevant to the problem.
Duplicate of MC-6738 , please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.