Invisible Nautilus Hook
The laning phase is arguably the most important time for an ADC/SUP, and hiccups in the laning phase can cost a game. This bug I am referring to is the Nautilus hook bug. If Nautilus is in a bush and casts his hook, you will not see the hook leave from the bush giving you time to react; instead, it will not appear until it is actually on top of you, and by that time, it is already too late to dodge. Makes the laning phase unbearable and impossible to counter.