[0.13.1] Player's arms do not move from the idle position when aiming a bow

The player's aiming animation does not play when drawing back a bow, arms instead remaining in their state as when holding an item.

Affects 0.13.1, not 0.13.0. Tested in both Creative and Survival, only visible in third-person view or externally (through other players). Bow can be enchanted.