I have modrunner on epic wit 3 dlc add-on and i play game withaut them and some eror came, i close the game and when i start agein in game menu seed thet dlc is missing, i go to epic to instal 3 dlc i owned, but dlc don show to instal. I contact the epic game suport but they tell me to contact you. Her is the screenshot : ,
But in game map and vehicle show the dlc :

Hi. I got the same Problem.
Got the Game from Epic Store with...

MudRunner,
MudRunner-American Wilds Edition,
American Wilds Expansion,
Ridge DLC,
Valley DLC,
Old-timers DLC.

Is there any Solution for it? And if, who is responsible to fix this Problem? Thx in advance for any Help.

I got hte same problem too, I think its caused by mods.