After the recent update, objects using VRC Constraint experience positional jitter when moved. This issue occurs not only with mirrors but also in other contexts.
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You can observe the issue with this avatar:
avtr_e59ad73b-a8f3-48aa-99e2-cf795afd7aa4
This avatar is equipped with two traffic wands: one mounted on the shoulder and the other on a drone.
  • The traffic wand mounted on the shoulder does not jitter while mounted. However, jitter occurs when it is moved while being held in the hand.
  • The traffic wand mounted on the drone experiences jitter in its mounted state. However, there is no jitter when it is held in the hand.