[Gameplay] Jhin Q stops bouncing

The bug is that Jhin's Dancing Grenade stops bouncing further if I cast on a target and kill it (and sometimes simply autoattacking w/o killing) before the grenade lands on the unit. The bug happens every 2~3 times, or very frequently. An example of the bug would be:

1. Cast q on minion A, who is next to low-health minion B
2. After seeing that it hit minion A and is about to bounce to B, last hit minion B with an autoattack.
3. You will see that it will not further bounce to minion C or D. Before the patch, the grenade still bounced whether I killed it or not, and the bug became extremely annoying during farming.

EDIT: The bug happens even when 1. autoattack doesn't kill a unit 2. autoattack hits a completely unrelated unit