The bug

Villagers can trade arrows of luck, which should not be obtainable in survival.

How to reproduce

• Summon a villager with

  /summon villager ~ ~1 ~ {NoAI:1,VillagerData: {profession: "minecraft:fletcher", level: 5, type: "minecraft:plains"}}
  

  (You might need to do it multiple times as it's a rare trade)

Attached test world with a villager in