I don't know if this is really a bug, but polished deepslate can't be crafted into furnaces unlike polished stone. Is it supposed to be like this?
MC-222569
Polished Deepslate can't be used to craft Blast Furnaces
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(Unassigned)
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(Unassigned)
blast_furnace, craft, polished_deepslate
21w14a
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Invalid, blast furnaces are normally crafted with smooth stone and there isn't smooth deepslate.