Summary: If you replace the skeletons weapon with a crossbow, and tries to attack with it, it does nothing and holds it in a weird way. Same thing goes for strays.

How to reproduce

1. Summon a skeleton/stray
2. Use the command:
3. For skeletons: /replaceitem entity @e[type=skeleton] slot.weapon.mainhand 1 crossbow
4. For strays: /replaceitem entity @e[type=stray] slot.weapon.mainhand 1 crossbow
5. Be in survival mode

Observed Result: The skeleton/stray holds the crossbow weirdly

Expected Result: The skeleton/stray uses the crossbow like the Pillagers do