https://www.youtube.com/watch?v=JlsKGj_mR5o
On this video I have oneachframe loop running on server broadcasting #n of update and servertime. Client displays this in systemchat. If previous servertime value equals to present, the message is displayed in sidechat.
As you can see from video this servertime non-update happens quite often and also depends on what player is doing. I can find a spot on the ground to look at and no time freezes happen or some spot where this happens very often.
This is merely indication of a larger problem. If I try to read position of a moving object with every update, when time freezes the returned position also freezes. In fact this is true for both global and local objects.
On headless client on the other hand this does not happen.