Unbreakable items revert after being recrafted in crafting

Give yourself an unbreakable item for example a diamond pickaxe with
/give YourUsername diamond_pickaxe 1 0

{Unbreakable:1}

and do that twice
then open 2x2 or 3x3 crafting. Put the items in and it no longer says unbreakable.

PLZ FIX