(GAMEPLAY) Lux ult bug

Was watching the Lcs spring split TL vs TIP and saw a lux bug that I have had happen to me in the past and have ignored. Don't know how to recreate it but the time stamp is 29:21 - 29:30 for the scene I'm referencing. The ult misses the minion that it obviously goes through, but hits the minion below it that the ult barely hits.