Using timeline to manually animate curvy position.

[gtpdz]

Hi,
Do you have a simple reproduction project/scene to share with me so I can analyze properly this situation?
Thanks

Here is the scene:

Google Drive Link

It has a cube that follows the spline with key framed spline position and a cube that does simple unity position key framed animation, both followed by a cinemachine camera.

Noticed the jittery motion in the first cube, which seems gets worse when played in timeline mode.

Update: I do noticed that this jittery motion is gone when setting the spline controller mode to Late Update + use cache, any other mode will still result in the jittery.