Unable to target Combat Master Vanyek in Vranik

In quest with infiltration to Vranik, after escape I’ve decided to kill all bandits in Vranik, but stuck on Combat Master Vanyek. When I hit him, he becomes untargetable, arrows just don’t shoot in him, and sword attacks stop like in grease. It is really frustrating that it is not possible to kill that cheating bastard, please fix it.

He is meant to live. Probably pop back up later in the story… You can’t target some important story NPC’s. You can’t target him at the beginning of the game outside of the fighting arena as well.

He has to live for the story. I went there and without going in got him and some others
to come out. He can’t be hit. If when I left him alone, he didn’t attack me and would talk
to me.

Im experiencing this bug when training with Vanyek at Vranik. It seems i cant hit him. I try to press attack but it just does nothing. (PS4) what should I do?