Any item enchanted with Mending doesn't always receive the XP needed for repair. Instead, some of the XP goes to the player, making XP farms take longer to repair items. XP is supposed to immediately go to an item with Mending if it's not at full durability, regardless of whether it's in the main hand, off hand, or armor slot. It is also supposed to randomly choose 1 item if multiple have it, which is the only part of Mending that is working correctly. If this is working as intended, please change this