[GAMEPLAY] More Sion invulnerability in Ascension

I know that this HAS been discussed before, but I'd like to draw more attention to the Sion invulnerability bug that happens in the Ascension game mode.

Now, I'm attaching a video of my own (pardon my low League Replays skills) that tries to bring more insight on what had happened. In short - I became invulnverable as Sion upon ascending while dead, but under the effect of the passive.

What you CAN'T see in the video, however, are these details:

1. I've lost my immunity after randomly teleporting onto the upper left teleport pad.
2. I've managed to pull off the Ascension under the aforementioned circumstances again, but the bug didn't occur.
3. My ultimate would re-cast itself immediately upon being casted.

I hope I've been able to bring some more insight into the problem.