I've read this report from others but they all say they're resolved. I've tried all different types of fuel but nothing works. I can smelt other things using coal and wood planks but when a block is in the top space nothing happens.
I don't know which version it is so I put 1.17.34. because I had to choose one.
It's the Xbox 360 Edition
Thank you for your report!
We're tracking this issue in MCPE-139345, so this ticket is being resolved and linked as a duplicate.
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