[GAMEPLAY] Jinx ult, Super Mega Death Rocket! disappears mid flight.

I was supporting Jinx as Braum, I engaged on Thresh, we did damage and in the end Jinx used her Super Mega Death Rocket!. The skillshot disappeared midair. At first I thought Sivir somehow spellshielded it, but after watching the replay I clearly saw that this was not the case. The rocket is visible for a moment, but it disappears and deals no damage.

1. Be Jinx.
2. Use Super Mega Death Rocket!.
3. Be unlucky enough for this bug to occur.

I made some research (Googled, jinx ult disappear) and found out that other people have had the same problem in 2014 and even 2013. This bug has happened in an lcs game too.

My (poor quality) video of the bug: https://www.youtube.com/watch?v=GS3nrRt6bS4 Someone else having the same bug in 2014: https://www.youtube.com/watch?v=hiesB9ExUtI Another video from 2014: https://www.youtube.com/watch?v=SEkzlDZNMpM This bug in lcs: https://www.youtube.com/watch?v=UhkHyppggT8