Greetings Exile,
Thank you for reaching out to us. Please ensure that your save is stored on the Xbox cloud before trying each of the following:
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Reset the console cache by holding the power button for about 10 seconds until the console powers off, then disconnect it from the power outlet for a couple of minutes, then try loading it into your Singleplayer session.
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Try to perform a soft factory reset while keeping games and apps.
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If the above procedures don’t help, please try to perform a full reinstall of the game.
We hope these steps help, if they don’t please do not hesitate to contact us again.