Expected Behavior

I expected the cart to pull a player
Cart to be in the location server sided instead of client sided

Actual Behavior

Player hovers over block and stays hovering until hops out
Cart is not serversided and runs solely on the client.

1. Driver's POV: Player was only levitating and not in cart, nor was he riding the cart.
2. Rider's POV: Player was in cart and riding along with the driver, once out, teleports to original position.

Note: It does not matter if you are dragging yourself or with a horse.

Steps to Reproduce

Create Cart
Ride Cart
Have a driver move a few blocks
Hop out

Version of Minecraft, version of Animania, Single Player or Server

1.12, Latest on Forge: 1.12.2-1.6.2, Multiplayer MCProHosting Server.

Screenshots encouraged