Slowed player movement while loading a crossbow persists after the crossbow is loaded

Synopsis

When loading a crossbow, the player's movement is considerably slower. However, this slowed movement persists after the crossbow is already loaded, and will not stop until the player has released the "Use Item" key.

To reproduce

Enter a world and load a crossbow, but do not release the "Use Item" key (which is right click by default). Notice how the player continues to be slowed, even though the crossbow loading is complete.

 

This is possibly intentional, but seems as though it is not.