Sion Passive on ARAM + Yorick Ultimate.

Hello everyone, I seemed to have found an issue with Sion's passive when he is played on ARAM (note: I'm not sure if this issue exists on other maps, as I have not encountered them). Sometimes, when I died fighting with my teammates, his passive simply would not trigger.

Here is the team set up (this may help as some abilities may cause the passive not to trigger):

Blue Team:

Purple Team:

I'm thinking that perhaps Garen's silence could have been the culprit, but I think Yorick's ultimate may have had something to do with it as well. After Yorick's ult wore off on me, I did not respawn as "Raging Sion", but instead went to the grey screen immediately.

I'm going to test this out with my friends at some point during the day, so I will most likely update this post within the next hour.

If anyone else has experienced this or knows the cause, please let me know. It has caught me curiosity.

EDIT: It turns out Yorick is the culprit. A few of my friends and I went into a custom game with Sion and Yorick vs. Garen. The silence was no problem, however Yoricks ultimate was.

Once Yorick ults Sion and the mark disappears, Sion will not go into rage mode. ALSO, this was on Summoner's rift. So I assume it applies to all of the game modes.

EDIT: The bug was fixed in patch 4.19, so it shouldn't happen anymore.