Mobs spawned with /summon don`t wield any weapons or items

When you summon a mob using a command block-
ex:

/summon Zombie ~2 ~2 ~2 {Riding:{id:"Cow"},ActiveEffects:[{Id:1,Amplifier:2,Duration:1000,Ambient:0}],Attributes:[{Name:generic.maxHeath,Base:100.0}],DropChances:[1.0f,1.0f,1.0f,1.0f,1.0f],
Equipment:[0:{id:minecraft:diamond_sword,Count:1,},1:{id:313},2:{id:300,Count:1,Damage:0,tag:{Unbreakable:1,display:{Name:"Name2"},ench:[{id:0,lvl:4},{id:1,lvl:1}]}},
3:{id:307},4:{id:310}],CanPickUpLoot:1,CustomNameVisible:1,CustomName:NAME}

• it won`t wield any items or weapons but it will drop then upon death.
  It occurs with Zombies,Skeletons and ZombiePigmens
  I tried with numeric IDs and they also don`t work
  Ps.Sorry for my english