Tools with Unbreaking enchantment will break

Put the summary of the bug you're having here
Enchantment
What I expected to happen was...:
My Diamond Pickaxe Would not break

What actually happened was...:
I had a diamond pickaxe with unbreaking and it broke

Steps to Reproduce:
1. Get The the pickaxe almost broken
2. ... Get Enchantment Unbreaking
3. ...Break Things and it will dissapear