The bug
If you have a bow or crossbow in the offhand and an arrow in the main hand, then throw the arrow out of your inventory, the bow or crossbow loading animation will not stop/disappear.
How to reproduce
Take a bow or crossbow, move it to the off hand.
Get yourself an arrow.
Pull the bowstring or load the crossbow.
Drop the arrow, without releasing the bow or crossbow.
→ ❌ Animation of the bow or crossbow does not stop, and if you release the bow or crossbow, nothing will happen.
Might have the same underlying cause as MC-81773, where the check is done as the bow is being drawn but not when it fires.