I've just been doing "The Black Garden" mission for one of the daily bounties using Bad Juju as my primary. I have the String of Curses perk unlocked and it works as it should for all of the enemies I've killed apart from the Harpy Disciples, where when you kill them the gun doesn't auto-reload?
Also, it can be pretty frustrating after I've killed an enemy that the rifle can reload with 13 or 14 bullets so I'm left with 1 or 2 for my last shot before having to manually reload. So I think there could be an update with the way that the pulse rifle ammo counter is displayed. Instead of saying 15 bullets I think it should just say 5 shots so that when I kill an enemy and the gun auto-reloads I actually get the full 5 shots (with 3 bullets per shot) and not 4 and a 1/3 or 2/3?
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Apparently harpies explode when they have taken enough damage, so you aren't killing them, leading to no "on kill" effects.