Using latest client (1937) and latest SDK (3.10.6), a newly added component, VRCVelocityTracker, is always null, no matter how it's accessed or not.

Both on Udon Graph and UdonSharp.

Editor environment works good, but it's missing in the client. GetComponent<VRCVelocityTracker> also returns null, so it's possible that the client's VRCVelocityTracker and SDK's one does not match.