Aatrox passive
As I was fighting the opposing jungler, Rengar, my passive was surely up as it was red yet it failed to revive me. The other jungler also immediately called it out as he won because of it and was just as confused as I was. During this fight he was able to use his smite because of
and I believe this may be the cause of it as it is still a new gameplay item. Riot please look into this to see if it is an actual bug.