Lost in Translation - Bug

Hi guys,
I encountered a strange bug, during the Lost in Translation side quest (the one with the cuman prisoner at the mill). I got the vagabond from the other mill to translate when I’m interrogating the prisoner, after that I confronted the translator about what the cuman really said, and he admitted the truth. After that i shared the infos with the miller, and right now I’m supposed to take the cumen prisoner with me to get the treasure, but the Cuman do not do anything, just sits in the shed, and I have no option to talk to him, only to pickpocket, and no matter what i do, I can’t talk to him.

I’m playing on PC, 1.5 version, if that matters. Is there anyone who encountered the same issue? Does anyone have an idea how to solve this?

Yes, kinda. I wanted to bring him to rattay, without the translation stuff. He wouldn’t come with me, but I could give the miller half of the reward from the bailiff (which I actually never got).
Also on 1.5 second playline

I’ve never heard of this quest…how did you unlock it?

My Cuman is invisible… but quest disappeared after I finished game. The only thing to fix this is to load save before starting the whole quest line.