So I've noticed this bug while playing URF yesterday 9/14/19. I've tried to replicate the bug in practice tool both with Auto Cooldown refresh and without and I couldn't reproduce it. I must note that ARURF is unique in that regard, so **the bug seem to be Unique to ARURF**.
1. Play Garen in ARURF.
2. Press E to spin on a target.
3. Press Q while E is active.
4. Q will hit the target, but:-
I) It happens multiple time throughout the duration of a single Q.
II) Deals no damage.
III) Doesn't Silence target.
Here is a Video demonstration of a replay from yesterday (9/14/19) on jungle monsters.
*Notice how pathetic Garen E has become..