Spire of the watcher possible Akelous cheese bug

At the weekly reset and today I did the first boss encounter to help my friends to get the Hyerarchy of needs exotic bow. In both of them Akelous bugged after the explosion when you dont reach half health bar and didnt get its shield back letting us made an easy 1 phase. I noticed that I was using in both the Vs Velocity Baton with the new weakening artifac mod and in both I fire it just when it whas doing its explosion animation. So, there's my theory, has anything similar happened to anyone else recently?

I will try to duplicate it again tomorrow, if I manage to do it I will let you know here