Camera jitters when following a moving object

How to reproduce:

1. Open the attached "Jittering" project
2. Open the "MixingCamera" scene (Assets/Samples/Cinemachine/3.1.6/3D Samples)
3. Double-click on the Game tab to maximize it
4. Enter the Play mode
5. Try driving back and forth using "W/S" or "Arrow-up/Arrow-down"
6. Observe the jittering effect in the background

Actual result: The Cinemachine follows the car and has a jittering effect
Expected result: The Cinemachine follows the car smoothly

Reproducible with: 3.0.1 (6000.0.0f1 (7bea50d699a2)), 3.1.6 (6000.0.0f1 (7bea50d699a2), 6000.0.75f1, 6000.3.16f1, 6000.4.8f1, 6000.5.0b9, 6000.6.0a5)

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Note: Reproduces with either VSync on and off