We apologize for the inconvenience, but this is currently a known issue.
The team is currently working on a fix that should fix the issue as soon as possible.
Thank you for your patience while we work on the solution! ^TK
Please visit our bug report site to see if the problem has already been reported: msft.it/6018b5Kza. You can upvote if the issue hasn't been resolved. If you think you've found a new bug, visit our help site here on how to submit a report! msft.it/6019b5Kzx ^TK
You may wish to try restoring a backup of that world that may help restore that progress. You can contact us at msft.it/6012belQq if you need help with restoring those backups. ^AC
Are you receiving any errors when attempting to download the game? If so could you provide screenshots of what's happening? We'd be happy to look into this for you! ^AC