T3 DPS WAR 6 PC Working as Intended?

“Your melee critical strikes against Undead enemies grant you 2% increased damage done to Undead for 30 sec, stacking up to 9 times.”

I was farming the mobs near Chillwind Camp and noticed the bonus damage buff does not actually last 30 seconds, once the undead target dies, the buff instantly goes away.

Is this working as intended?

Those buffs do indeed cancel immediately when you leave combat.
Has always worked that way as far as i can recall.

am I the only one who thinks this is odd? Hm…