Family values sir hannush disappears before interrogation

Ok i posted in the bug section on this forum a few days ago i was able to work around it but now i have a new bug im on the family values quest right before you interrogate erik and i can’t interrogate erik because sir hannush disappears before he can speak to erik
I just i cant with this game any more it feels like im fighting the bugs in this game and not sir tosh

Ha i went to the upper castle in rattay and i find sir hannush getting off a bench and then the game bugs him back into the bench i really have no idea why this happens please help