I just played a game two minutes ago, with my owl hunter vs a freeze shaman. I played Nine Lives to trigger the Humungous Owl’s deathrattle, and this did not happen. I am on PC and the owl was still added to my hand when I discovered it, if that matters. Also, the owl was frozen when it died.
Edit: It just happened again in another game lol.
This could be related to the priest call of the grave bug. Deathrattles not triggering. Might get fixed at the same time.
Probably a similar issue. The bug hasn’t triggered times before those games I played yesterday.