Copper chests worn on copper golems' heads are not visible

Steps to reproduce

Execute the following command to summon a copper golem with a copper chest in its head slot.

summon minecraft:copper_golem ~ ~ ~ {equipment:{head:{id:"minecraft:copper_chest"}},NoAI:1b}

Observed behavior

The copper chest will not be visible.

Expected behavior

The copper chest would be visible, as is the case for (regular) chests, trapped chests, and ender chests.