Baby Zombies do not drop any loot / xp

While messing around on Creative Mode, I gave a Baby (Villager) Zombie some armor and a sword I enchanted, for it to use. Later, as I was going to do something else in the world I was playing on, I went back to that Baby Zombie to retrieve my stuff, so that it wouldn't despawn while carrying my stuff. But then, when I killed it, the Baby Zombie didn't drop ANYthing--let alone not dropping my stuff, it dropped no experience orbs, no rotten flesh, NOTHING!

What I expected to happen:
The Baby Zombie would (at the very least) drop the items I gave it.

What actually happen:
The Baby Zombie dropped ABSOLUTELY NOTHING!

Steps to Reproduce:
1.Find a Baby (Villager) Zombie that can pick up items.
2.Give the Baby Zombie a weapon and some armor. (The stuff I gave after I discovered this bug were: A Diamond Sword enchanted with Sharpness V, Looting III, Knockback II, and Fire Aspect II; a Diamond Helmet enchanted with Protection IV, Respiration III, and Aqua Affinity I; Diamond Boots enchanted with Fire Protection and Feather Falling IV; a Diamond Chestplate enchanted with Projectile Protection IV; and Diamond Leggings also enchanted with Projectile Protection IV.)
3.Kill it (or have something else kill it, i.e.: An Iron Golem); the final result should be that the Baby Zombie doesn't drop anything.