This bug can happen in both PvP and PvE.
Today I was fighting in Raid. One of my hero has low health (blinking red). When opponent finished their attack and I watched them. Their hero didn’t hit my low health hero. All of the sudden, she was dead without damage value on. I thought I might have missed the attack.
Then it happened again later on while I was fighting mobs in PvE. I killed 2 mobs on the right handed side and had 2 left on the left handed side. One of them had very low health (blinking red). Then my match was connected on the right side of the map. Once my combo ended (not hit any mobs), the low health mob all of the sudden died.
Does this happen to anyone else?