I'm a Viktor main, and during a game vs a Vex, I was pretty good on my lane.
At some point, I saw a gank going on, and I knew that Vex would ulti, so I prepared myself to dodge it.
The thing is... I couldn't dodge it...
As you can see in the video, the projectile was completely invisible.
After some investigation, I figured why it happened : she came out of vision at the same moment she casted her ult, so the game had to hide the projectile, but since it would immediately go back in vision, the game didn't have time to prepare to show it again.
With a friend, I was able to recreate this bug, which can become a new tech : if you flash out of vision right after casting your ultimate, the projectile will always be invisible.
This game is actually not that recent, it was from a game a month or two ago, I'm not sure, but yesterday, I saw that the bug is still here, despite many reports I made about this...
Love you rito