Bug description:

Though this is not technically a bug, this exploit allows players to easily gain huge amounts of diamonds and emeralds using the Blast Furnace’s un-crafting.

Steps to reproduce the behavior:

• Find a blacksmith villager and level him up to get trades for diamond armor, and a trade for selling diamonds for emeralds.
• Repeatedly turn the blacksmith villager into a zombie and cure him until diamond armor is at a very low price - at most 1 less than the number of items it takes to craft the armor piece (e.g. 6 emeralds for a pair of leggings, which need 7 diamonds to craft)
• Buy as many pieces of diamond armor as possible and un-craft them all using the blast furnace.
• Sell all gained diamonds back to the blacksmith.
• Repeat this process until you have as many diamonds and emeralds as wanted. (Diamonds are gained through un-crafting, emeralds are gained through selling diamonds).

(At its most, 1 emerald = 8 diamonds = 8 emeralds = 64 diamonds = 64 emeralds = 512 diamonds, etc…)

Environment:

• Minecraft: 1.14+
• Mod Loader: fabric
• TechReborn: Any version of TechReborn where diamond armor can be un-crafted

has been overhauled in 1.18.2. Not much more difficult than infinite diamonds with matter fabricator imo. Infinite Emeralds already exist in vanilla.