/kill Not Killing Invulnerable Entity

 If You Summon An Entity With the Invulnerable tag Eg; /summon Cow ~ ~1 ~  {Invulnerable:1} and kill it with the kill command Eg: /kill @e[Type=Cow] It Will Not Work, Even Though The Console Says It Has. Note When You Hover Over The 'Killed Cow' It Has No UUID