Pretty self explanatory, the image looks like the top of a furnace.
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minecraft:lit_furnace

Thx.
Confirmed.
Regression of MC-7133
So is it resolved?

No.
Regression = A bug that was fixed in a prior version reoccured.
Confirmed for 14w11b
Confirmed for 14w17a
Weird, it's fixed, but I was told it was intentional...

Who told this ?
Nevermind. You said it was a regression, which at first I thought meant this was what expected because of the earlier bug. It is all a misunderstanding. 🙂

OK
Now when I give myself a burning furnace, it has no texture in inventory. 14w26c
I've created a new ticket because it's a different issue: MC-59234.
What's the block name for "Burning furnace" ?