Lego DC Super Villains DLC content not saving.

I need help with a problem I am having. I started a new game on Lego DC Super-Villains, and after I played the DLC levels, I saved my game and quit. When I loaded back in, none of the content I got was saved, and I have spent two days trying different methods. I am playing this on Nintendo Switch 2. Can someone please help me with this?