I'm not sure I'm in the right place but I'm playing Warhammer 40k Inquisitor Martyr and I'm stuck on the 5th intro mission, Madness Incarnate, on a new character on PS5. I play the mission and complete it and watch the cutscene where the Martyr flies into the warp and it takes me right back to mission selection showing the mission as incomplete.

Edit: I solved the problem by logging out to the main menu the logging back in and finishing the mission one last time.