IDK about that tomb since I don't have the Season Pass, but if reloading the game doesn't work, I think Spirant said on Xbox One........ you can push both RB/LB(?) on load game and it will bring up various save files.
So should be able to choose a file before the auto save.
@SpirantCrayon22 could prob tell more since he found out about it last year
@SpirantCrayon22