So I'm having an issue with mending. I am running my AFK fish farm and my Fishing rod will only get to 60/64 durability then I start getting the xp directly. I was under the assumption that the xp would then mend my off-hand and items on my hot bar.. Am I incorrect? I have attached a screenshot of my F3 screen that also shows my hot bar. Any help is welcome.
When you pick up an experience orb, one of your items that has mending (in the armor slots, mainhand, or offhand) is selected at random, even if it has full durability. If it cannot be repaired (or if the item was over-repaired), the remaining XP goes to your experience bar rather than to a different item.
If you want to mend specific items, you'll want to not wear/hold items that would interfere (such as by taking off your armor that has mending to remove chances of them being selected).
So that is why my rod will not go higher then 60/64? And my armor doesn't need and mending so I'm still getting the xp to my bar.
To clarify: if the item would be over-repaired, it will still get repaired but there will still be some experience leftover, which then goes to your bar.
The reason your fishing rod is not getting repaired is because another item with mending is being selected. You'd just need to keep gathering XP and it will eventually be repaired, as the item to repair is random.