[BLOCKING] Cannot clear items from armor slots by name

Verification builds: 1.2.2 Build 503712
Summary: /clear @x itemName doesn't properly look for items in the armorslots.
Impact:
We cannot clear items from a player's armorslot without clearing their entire inventory.
Repro Steps:
1. Put a golden helmet on or any other piece of armor.
2. /clear @p golden_helmet
2b. This will perform the same with any other piece of armor.
Observed Results: "Could not find any items to clear"
Expected Results: It should clear from those slots.
Notes: