No buffs, debuffs, or passives showing.

iStaples

In the event quest and there are no buffs or debuffs triggering. Tried this in arenas and Alliance War. I captured a video of this in the event quest. Here are the screenshots. You can clearly see Kingpin against Onslaught taking degen damage but nothing is displayed. When I had the game paused you can see the buffs and debuffs that are active currently but when I exit the menu they are not seen.

GroundedWisdom

That happened to me. Force closing the game and restarting worked.