Hello @Cebelicus, have you previously reported this issue?
Are you able to play online without any issues?
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.