I tried to get some sooth stone in the new update for the floor in my house. Smelting stone did not get me a block of smooth stone.
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i am also running into this problem.
i also have tried placing the blocks and re-mining them, and re-smelting them into new stone. new stone also does not smelt into smooth stone

I had the same problems, it only affects stone obtained by silk touch, they will not smelt.
stone obtained by smelting cobblestone can be further smelt into smooth stone though

I am having the same issue. Cannot smelt stone into smooth stone after smelting from cobblestone.
Had no issue with this prior to the update (had stacks of stone running through a furnace via a hopper and they just stopped as soon as the updated applied).

Smelted stone and silk touched stone do not smelt. Smooth stone is completely uncraftable in survival, and therefore (unless you had smooth stone before the update) anything crafted with it are uncraftable.

I have the same issue. I had stone smelting in a furnace, but after the update, it will no longer smelt. Very annoying. I do not see any patch notes saying this is an intended fix. I hope this gets solved soon!

Update: If you place down the stone, and re-mine it. Then it will smelt. It seems that the game does not like the old stone. (In other words, turn the stone from 1.12 into a new block (Cobble Stone) and then the game will accept it in the furnace).

We're tracking this issue as MCPE-54617, so this ticket is being resolved and linked as a duplicate.
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Was the stone smelted in 1.12?