Description: Using the middle button I tried to pick up the furnace that was active, and it had no textures on the sides just as dispensers and furnaces on the first release after 1.4.7.
How I discovered it: I was playing in creative and made an automatic cooker, and I accidently clicked with the middle button on the burning furnace and I saw it had no side textures. Also it was weird because we cannot pick up burning furnaces before these releases...