The world is not fully synced or has been corrupted. Try playing the world on a console where it is in a good state and try migrating it again.
I have reset the console. Uninstalled minecraft and reinstalled it and also cleared the local data on my XBOX. I have used this world for 3 years and no issues until I did a soft reboot on my console. I need the communities help to get this world back.
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're tracking this issue in MCPE-40552, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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