/summon minecraft:zombie ~ ~1 ~ {Attributes:[

{id:"minecraft:zombie.spawn_reinforcements",Base:1.0d}

],HandItems:[

{id:"iron_sword",Count:1b}

],CanBreakDoors:1b,CanPickUpLoot:1b}

This is expected to work in the command block but it fails for no f***ing reason, none of the command is red