The bug
Pillagers don't have any arms if they aren't carrying a crossbow.
To reproduce
Spawn a pillager
Spectate it
Run
/replaceitem entity @e[type=pillager,distance=..1] weapon.mainhand minecraft:air
→ ❌ It no longer has any arms! (Well, it no longer has a crossbow, and it has no actual arms as well.)
Linked issues
is duplicated by 15
10 more links
affects 19w41a