Target nameplates don't get hp updates

What this problem is related to? (e.g. Website / Launcher / Game / etc. ): Game

NPC Name, Quest Name, Skill/Item Name (if relevant):

Describe the problem:
So the target nameplate’s hp level doesn’t get real-time updates.
It only updates, as far as I noticed, in the following cases:

  1. Untarget it and target it back again.
  2. Change the target’s(I assume) state. From sit to lie, from stand to sit, e.t.c.

List the steps to reproduce the problem (if relevant):

Screenshots/Videos (if available):