Legendary Brennos Atack: ship kill not accounted to complete the quest

[Vitalivs]

Today I was doing legendary brennos atack COOP, we kill the ship but the kill was not accounted by the game. So, the quest can not be completed. This bug is almost the same as the bug reported in VoK, where the kill of the priest boss is not accounted too. See the attached image.

 

[Faluzure]

I see you are playing Norse. Any chance you had a Fortress nearby attacking the ship? I've seen a trend of people not getting credit for kills, usually on the quest to protect the wonder, and they are using upgraded fortresses and burning damage.