Copper golems with doors on their heads only display the bottom half of the door

If a copper golem has a door in its head slot, only the bottom half of the door is displayed, rather than the entire door.

Example command: /summon minecraft:copper_golem ~ ~ ~ {equipment:{head:{id:"minecraft:oak_door"}},NoAI:1b}

Either display both halves of the door, or display the item model instead (which also effectively contains both halves of the door).