The Bug

The crafting preview for smelting copper, coal & emerald cycles through Deepslate Copper, Coal & Emerald despite those Deepslate Ores being unobtainable in regular survival.

Reasoning for creation

This could potentially mislead players of thinking that they can obtain those block without the use of cheats or other means.

Reproduce

• Get the stone versions of Copper, Coal & Emerald
• Get rid of them
• Open a furnace/blast furnace
• Click on the recipe book icon for Copper Ingot, Coal or Emerald
  Notice that it cycles through the Deepslate versions