In f5 mode, the item in a player's hand is not In the hand, but floating near

Put the summary of the bug you're having here

What I expected to happen was...:
The item would be in the player's hand.

What actually happened was...:
The item was floating near the player's hand.

Steps to Reproduce:
1. Hold an item in the selected inventory slot
2. Press f5 and the item is not inside of the hand.
3. ...