Greetings @Benjibro333 ,
Thank you for reaching out to us.
Here’s some steps that might help you. 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 SP 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.
Can you also try the suggested steps from @Lucidique ?
Regarding your save, do you have the possibility to load a previous save?
We await your reply.