Malzahar E sound missing (awkward)

Alright so the last 2 times i've played Malz, when my E bounced from a dead minion to the next, there was no sound. I don't know if this is intentional or not, since I hadn't played him since the rework, but it was unsettling for me: i was used to hearing the "boing" whenever the E proliferated to another target.