Loaded Beta, still happening, attached image with other item buff (lightning-forged augment rune). Additionally this issue is intermittent but seems isolated to the warrior and paladin. I have many other toons/classes without this issue.
I discovered if monitoring for missing buffs and have a custom buff to display an icon, this can case an issue where the buff is always missing. Specifically I found this on a mage with Ice Barrier.
It might be related and it's fixed in the release.