Hunting Knives Damage Bound Hearts Irregularly

When attacking a Bound Heart with a hunting knife, you get behavior I find a bit odd and counterintuitive, possibly defective as I'll explain below. These are what I consider "odd":

• Bound Hearts have a "front" and "back" side. It feels like they should be completely vulnerable to backstab attacks from a knife no matter how you attack it.

  • When attacking the "front", a knife will slash from side to side and occasionally strike the weakspot represented by the physical heart.

  • When attacking the "back", you can get the backstab animation with higher damage, and sometimes (I can't reproduce this despite trying) will get significantly higher damage as if you got a heartshot with the knife. I feel like there is something going on with the weakspot vs backstab determination here.