unity Arfoundation jitter when animation play in cinemachine timeline

Unity Engine
1

I was trying to animate on top of the reference position, somehow I got a very intense jittery effect

does anyone encounter the same problem?

2

Hi, I’ve encountered inconsistent jittering in timeline when keyframing items that are parented to other items that are moving (for instance, a character is running while holding a sign, the sign will jitter while the character does not).

Previously I’ve solved this issue by changing the Update Method on my Cinemachine Brain from Late Update to Smart Update.

However, as of Unity 2019, this solution does not work anymore and I cannot find out how to get rid of the jittering. (If you find any solutions, let me know!)