I know this isn't quite a bug, but I think the feature would be amazingly useful for nami as a support and it seems like a clever mechanic to add. Instead of having the damage from nami's W claim a kill on an enemy in range if you use it on an ally to heal them, it should claim an assist. I find a lot of times when I'm playing nami, I'll accidentally steal a kill when all I meant to do is heal my ally. If you cast it specifically on an enemy champion though, it should give you the kill.
Idk if this a great idea or a terrible idea, I don't want to take away nami's ability to play another lane, but at the same time, as a support, when we're bottom lane, or in a team fight, and my ally is about to die, and the enemy they're fighting is about to die, and I heal my ally, I accidentally ks them. similar to how leona can't activate her own passive and it gives assists instead of kills(when the both the passive and killshot are available).
an example would be heal an ally near a opponent who is near death and get an assist and if there's another low health enemy nearby you'll get another assist if they die or if there's another ally near by they won't get an assist, they'll just be healed.
Cast the ability on an opponent for a kill, if an ally is nearby it heals them but doesn't give an assist, but if it goes on to kill another opponent, you get the kill and they get an assist.