Jhin's Invisible "Curtain Call" Shots

It seems inconsistent when this happens, but I and others have noticed several occasions in which the shots from Jhin's ultimate, "Curtain Call", don't actually animate on our screen. I have seen (or not seen) this issue a few times, but not enough to pinpoint the exact cause.

If I were to guess, I remember that most, if not all, of the invisible shots were killing blows. This observation might be because I and others only notice the lack of an animation when it results in our death without warning. Other than that, I have not noticed any consistent triggers for the problem. I normally would have written it off as a simple mistake on my part, but the fact that it has occurred multiple times, in multiple areas of the map and fog of war, and to multiple people on my own teams makes me think there might be a genuine issue.