Noticed for the past 2 days that if I don't land the killing hit on the boss during the "TARGET: X" bounties, I don't get the bounty completion.
Thought it was a one time thing but it happened 3 times in a row yesterday with the Nexus, on the 4th run everyone died and I just didn't revive them, one I killed him, boom, bounty done.
Didn't notice this until 1.1.2
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You don't need to land the killing blow for the bounty to trigger. You need to be doing damage to the target clear through its death. If you instead focus on adds (especially when the target is around 1/4 or less health), it is a very high chance of no bounty for you and you'll have to do the strike again. As far as I know, this is intentional.