Enchanting an enchanted weapon obtained by commands does not work

When you give yourself an enchanted weapon with a command:
/give @p bow[minecraft:unbreakable={},minecraft:enchantments={levels:

{'minecraft:multishot':1,'minecraft:piercing':127,'minecraft:infinity':1}

,show_in_tooltip:true}]
and attempt to enchant it with unbreaking 3, it does not work as it says it cannot support the enchantment