Stone mined in survial cannot be smelted into smooth stone. Stone mined in survival and stone picked from interface of creative will not stack. Stone from creative interface will smelt into smooth stone.
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Thank you for your report. However, this issue has already been reported as MCPE-47907. If you have anything to say feel free to comment there. Also, make sure to search for an issue before creating a ticket. Have a great day! 🙂