FearLess Cheat Engine

Another problem occured in game version 1.21. After using spawn options forcing the uruk role, the arena maggot is blank now... I've tried every possible means, but still blacnk. And this arena cannot fight even I select an orc...black screen. So I come back to the previous question, is it possbile ...

Is it possible to refresh the uruk everytime entering the arena?
it would be easier to get an expectant uruk.