It sounds like this unit was built at the beginning of Covid and they were short-staffed, getting ready to shut down for a while and just trying to get everything out the door. That is no excuse, but something I could see happening at that time. If it was built prior to that, then I haven't a clue why they would have thrown it together in such a way.
Have you thought about taking it for a drive to Lancaster CA and having a visit with Lance? I think I would do that. Show them the problems and take the paperwork from your dealer about everything he has done for you.