Furnaces are not smelting stone into smooth stone. Also some stone stacks still do not combine (/are reading as different data tags?)
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put stone in grindstone

Can confirm. It happens in 1.14.0.1 also.

Can confirm. It happens in 1.14.0.1 also.

@ Noel that's not how it's supposed to work but I did try that as well. No luck. Smooth stone is a furnace item. I waited a couple days before posting this.
Update* it's working for any cobble I just cooked into stone so it may be an issue carrying over data values from pre-beta but stone has a tendency to form 3 separate stack groups... I.e. it's acting like at least 3 separate block types with the same name. Almost like renamed items would. It would do that on 1.12 on realms as well before I joined beta.

@ Noel that's not how it's supposed to work but I did try that as well. No luck. Smooth stone is a furnace item. I waited a couple days before posting this.
Update* it's working for any cobble I just cooked into stone so it may be an issue carrying over data values from pre-beta but stone has a tendency to form 3 separate stack groups... I.e. it's acting like at least 3 separate block types with the same name. Almost like renamed items would. It would do that on 1.12 on realms as well before I joined beta.
put stone in grindstone