It would feel a lot better for LeBlanc players if when the primary target of your Q dies while the projectile is in the air it would still bounce to other marked targets to stay consistent with other bouncing spells like Ryze E.
Edit: Removed Jhin comparison
kattzkitti1 votesNeither of your comparisons make sense.
Jhin's Q is an entirely different mechanic, can't even be compared when trying to use it as an example for consistency in effects.
Ryze's E is analogous to LeBlanc's W, it's the setup for the spreading effect. You're wanting Ryze's Q for your consistency comparison.
All that being said however, I support the intent behind your post. It should ignore the target's death, instead of just fizzling.
tamrin1 votesMy comparison with Ryze E was that if the target dies while your E is midair, it still spreads in an area.