Pillager arms incorrectly positioned when riding or unarmed

The bug

A pillager's arm would go NUTS if its riding another entity for example - a Vindicator. If theirs a pillager with a crossbow in the world, the arms are normal (it also dosn't work if the pillager was spawned with a crossbow)

How to reproduce

Use the following command:

/summon minecraft:horse ~ ~ ~ {Tame:1b,Passengers:[{id:pillager}]}

or

/summon minecraft:pillager ~ ~ ~ {HandItems:[{}]}