Several users experienced jittery hands on Oculus Quest (Moving Grabbed Objects jitter (Unity) - Meta Community Forums - 814552). It looks like is a bug (Unity Issue Tracker - [Oculus GO][Oculus Quest] Object is jittering when position is being affected by Time.deltaTime) which will be fixed in Unity 2019.2.1. However, I found out that if you check “Parent Held Transform” on both AvatarGrabberLeft/Right, the objects stop jittering while grabbed and the whole movement becomes fluid. Unfortunately, this also produced a strange misalignment of the hands while moving them around.
More details here Moving Grabbed Objects jitter (Unity) - Meta Community Forums - 814552
Did anybody find a solution for it?