I’ve noticed this while farming the mounds. I’m sure most recognize the setting. The picture below was static for around 5 minutes. While I have not tried it on live, I never seemed to have this problem.
From my experiences, if you go off a cliff, thralls do take a bit to teleport down or up to you as they cannot chase after you. Now thralls also are just inconsistent, sometimes they will chase right behind you/port immediately. Other times you will be looking around and see them nowhere for minutes on end. Guess they need personal time.