Also does not show on druids in animal forms.
Also Limited invulnerability potion does not display often either.
That’s an issue with your UI, not the game.
I have re installed and ran no mods and the graphic bug is not consistent.
I have also reduced my graphics settings to truly awful and reinstalled my Nvidia drivers with the newest and latest and greatest.
I have also tested to see if maybe it’s a 1 in a million hardware issue, but encountered the same thing with my laptop.
This bug is most common in battlegrounds, perhaps it’s other buff graphics overwriting the graphics effect? No idea, but I can tell you for certain it’s not displaying 100% of the time.
Blizzard has a bug fix for other such graphics issues also related on the main page. I just wanted them to know about this so they can look into it =)
Have a great day!