When you go to nuka world market and try to initiate dialogue with any traders they won't talk at all, besides mackenzie brigdeman. She only has basic doctor dialogue, even if you start open season by killing the raiders she doesn't have the proper dialogue tree to turn it in. Preston and her won't even give options for open season. Tested on a fresh install with a new save with only the Ufo4p. Then tested it again without the Ufo4p just to double check and it worked, I'm on the xbox one if that would make a difference.