The movement of happy ghasts for non-controlling passengers is jittery

The Bug:

The movement of happy ghasts for non-controlling passengers is jittery.

For a visual example of the problem, please see the attached video.

Steps to Reproduce:

1. Get two players and label them "Player A" and "Player B".

2. Get “Player A” to ride a happy ghast.

3. Get “Player B” to ride the same happy ghast.

4. Have “Player A” move around while controlling the happy ghast.

5. Get “Player B” to watch the movement of the happy ghast closely.

Observed Behavior:

The movement of happy ghasts for non-controlling passengers is jittery.

Expected Behavior:

The movement of happy ghasts for non-controlling passengers would be smooth, just like how it is for controlling passengers.