[Gameplay] Kalista not properly affected by Malzahar Ult (and possibly other cc effects)

I noticed in multiple games that, when I used my ult as Malzahar on a Kalista, she would still continue auto-attacking her target (be it a champion or inhibitor). I assume that other suppressions may not work correctly either (e.g. Warwick's Ult).

Sadly, I did not capture this on video myself, but a side-search shows that the problem is mentioned many times on the internet, and has existed for quite a while already.

Someone else caught this bug on video here: https://www.youtube.com/watch?v=dD-p_9LPZno