For issues you find with the Switch and Console releases, please follow this link and give as much detail as possible. This is the speediest way to get info to Pipeworks and get a hotfix in the works.
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Wait, either it was outdated info, or it still applies today, I looked it up and either is no way to get a corrupted save file back unless you have a save file from before that you can access by going to your xbox save files somehow and override the corrupted one. :sigh:
I'm sorry to tell you, this sounds like your world has somehow been corrupted, meaning, there was a fairly common error between converting your world to the xbox one has occurred, I hope this wasn't your main world, if it was, I have felt the pain. Except mine was corrupted on the 360 (way...
Also, when I saw the title of the post, my mind instantly went: (to the tune of "What does the fox say?") "What does the Lutanic Cultist say? *ding x24 or something (did this to remove spam)* What does the Lutanic Cultist say? (lyrics continues to play)"