[Gameplay] Lux Q effect gets delayed

Experienced it before, but this was the first time, when i recorded it in real time. When the target recieves more than one CC at a time, sometimes the second one does not work or gets delayed, which makes a window for the enemy to use escape abilities like flash or dashes. This clip contains a Q, which reaches the enemy , damages her, even the visuals of the skill is displayed. Despite of these, she uses her flash after the end of the knock up. I am really sure that it is more like a bug than a feature :)