campaign autosave crashes the entire console

the other day, i beat the mission The Foundry. i didn’t receive an achievement for it, though, so i just quit the game.
recently i came back to try for a few different achievements, and i notice that my autosave still says it’s for the foundry and not the next mission, even though i did start it.

so i loaded it, and i got a light black screen with blacker silhouettes of some units and nothing else. the game is frozen. i press the guide button to quit out, and that doesn’t work. then the whole system reboots.

after it came back, i tried doing it again, and this time i actually got to see the game. the autosave is apparently RIGHT when the mission displays the “you won” screen, and it doesn’t seem to know what to do at all about that, so it just freezes and breaks everything.