So, after AFK fishing for a while, I was looking at the loot and found a Protection and projectile protection book. I though it would not apply to the items mutually, so I was enchanting items via enchanting table and I got a Protection III and Projectile protection IV Diamond Breastplate!
What I expected to happen was...:
They couldn't be applyed to the same item.
What actually happened was...:
They were applyed to the same item...
Steps to Reproduce:
1. Enchant some armor, or fish for a while.
2. ???
3. Thats it.
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Comments 4

***Edit: Fire protection can be applied mutually to the others too!
@Matthew James Riley The problem is, that if the item has too many enchantments, I can't apply the Mending when I get the book.
I can first apply the mending one first if I got my hands on one, but it's not so easy even when AFK fishing.
Thank you for your report!
However, this issue is a Duplicate of MC-141961.
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Like I said to the last guy to report this, count it as a blessing!!!