Furnace experience does not repair items with a repair enchantment.

The furnace experience from this new update when collecting the material that melts in the furnace and is collected by the user, this experience goes directly to the player's experience bar instead of the tools that have repair. You have the item in your main hand with repair and when you collect the experience with the item, it is not repaired and the experience goes to the player's bar, this happens in armor and tools.