I just played a ranked game with volibear, and the bug is simple, i had no passive. didnt trigger when going under 30% in any fight. icon stayed off CD.
First time i though it was because someone got me from 31+% to 0% instant but no, it happened again and again.
On a 30 minutes game i died 5 times, but if you look on game recap i healed for 1k8 total, which can't be possible since passive alone should have healed more than that. Rito please :'( lost a ranked over that bug, going crazy in fights i would have won otherwise.
I hope you see that soon and try to see how it happened.
Thank you for your time.