Spoilers. So, I’ve liberated the three regions. The mission “Where it all began” pops up on the map. I go there and after a couple of lines I choose the “walk away” ending. Then, the screen turns red, with “Only You” on the radio. The deputy likely killed the other people in the car. The credits roll. I skip them. The main menu comes up, and I select continue. When I spawn, the mission is still available to run and I tried it twice now, with the same results.
What should I do to continue playing, even after I completed the last mission of FC5?