Bug with the Boss in the Act IV

bug report refrence number: 130 086 939
After killing boss I got killed by post-death damage and bugged whole animation where he's getting killed. After restarting area it forces me to kill him again even though he's already dead there's even icon on the map clarifying that the content is done. Doors behind boss that allows me to continue story are blocked and I'm stuck on bricked account unable to go any further