bug Serial Killer Perk not working as described

[Kenpari]

Currently, the serial killer perk's description states that, when killing a human, a heart will always be harvested from them if they weren't hostile or didn't fight back. However, I've tested this many times with stealth kills, both from range and melee, and have never gotten a single heart from an instant kill on an unaware human. I've only tested it against hostiles, not innocent people, but according to the description, that should work as long as they don't fight back.

[Geirskogul]

Came here to see if this bug had been posted. Same here. Haven't gotten a single heart and I have had Serial Killer practically the entire game and I have killed basically every living thing I have come across, both aware and unaware.

[Geirskogul]

For what it's worth, it appears that the part of perk that automatically harvests the heart of an enemy that does not attack you under any circumstances(the civilian/bystander type NPCs as I have called them) DOES work. I was able to get the trophy for harvesting x amount of hearts doing this just earlier today.

 

So for anyone trying to get the trophy/achievement for harvesting hearts or just trying to get any value out the bugged perk you can still kill non-aggressive NPCs and get hearts that way. The other part of the perk as the OP described does not work though.