Hi @Zer0Lime, welcome to the forums!
We’d suggest that you first ensure that your save is stored on the XBOX cloud, before trying the following steps:
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Reset the console cache by holding the power button for about 10 seconds until the console powers off, then disconnecting it from the power outlet for a couple of minutes, then try loading into your SP session.
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If the issue persists, try to perform a soft factory reset while keeping games and apps.
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Should you still have trouble loading into the SP game, please try to do a full reinstall of the game.
Please let us know if any of these steps help.