Iron golem doesn't have an animation for sitting down

Iron golem doesn't have an animation for sitting down.
This is inconsistent with other two-legged creatures that walk upright.
Most likely it is WAI, since the golem is not really a living creature, it is created by the player.

Below is the command to reproduce:

/summon minecraft:boat ~ ~ ~ {Passengers:[{id:"iron_golem"}]}

/summon minecraft:minecart ~ ~ ~ {Passengers:[{id:"iron_golem"}]}

/summon minecraft:pig ~ ~ ~ {Passengers:[{id:"iron_golem"}]}