[Gameplay] Lucian Passive Not Firing Second Shot

Not sure if this bug is happening to just me, but when playing Lucian, sometimes (quite often; roughly every other minion wave) the 2nd shot on the passive doesn't go off.

This bug usually happens when you use an ability then attempt to last hit a minion while the passive is up. The first shot will go like normal while the 2nd shot never fires, even if the first shot kills the minion and there are other targets around for the 2nd shot.

It seems to happen if you last hit a minion with the exact damage necessary to kill it (+- 4ish damage).

This has only started happening often, after the most recent patch, 6.23. I know a bug like this happened/happens very infrequently in the past but this one occurs very often.