Serial Killer perk awarding more hearts than intended

[Pharismo]

From what I can tell it's awarding extra hearts based on the number of bullets that hit the target upon death.

Using a silenced Rattler actually rewards 8 hearts per kill becaue it's counting each bullet as a seperate kill.

I also tested this with a burst silenced repeater rifle and got 3 hearts per kill.

Attached before and after heart counters from killing a civilian in Fairfield. Started with 6 after using the Rattler (8 bullets) my heart total went up to 14. This also triggers the loot notification on the left part of the screen for each heart.