^{Update by Mega_Spud:}
Summary:
Occasionally, when a player connected as a client on a local multiplayer map glides with elytra, it will appear that the player is 'walking' through the air, and the gliding position does not show to the host or other players.

Steps to Reproduce:

1. Have a player connect to a local world
2. Watch as they glide with elytra

Observed Results:
Occasionally they will appear to be walking through the air.

Expected Results:
The player should be seen gliding with elytra.

Screenshots/Videos attached: No

Notes:

Original Description:
When another player using elytra in local multiplayer, sometimes show walking animation instead of gliding animation...