I had the same issue as John Riddle did on the 1st of June, 2021. If I click "Sync Last Saved Data" All of my worlds were set back by a few saves ago and almost half of my worlds were corrupted and unplayable. Managed to get my favorite worlds onto my new Xbox by opening up Minecraft on my original Xbox, clicking "b" every time the "your other Xbox is taking a long time to sync to the cloud" error pops up, getting a few actions between the error popup, and moving my 3 favorite worlds onto realms to upload them and download again from my new Xbox. Definitely scared me thinking my 500 mb world would be gone forever and want it fixed so that no one else has this problem.
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I had the same issue as John Riddle did on the 1st of June, 2021. If I click "Sync Last Saved Data" All of my worlds were set back by a few saves ago and almost half of my worlds were corrupted and unplayable. Managed to get my favorite worlds onto my new Xbox by opening up Minecraft on my original Xbox, clicking "b" every time the "your other Xbox is taking a long time to sync to the cloud" error pops up, getting a few actions between the error popup, and moving my 3 favorite worlds onto realms to upload them and download again from my new Xbox. Definitely scared me thinking my 500 mb world would be gone forever and want it fixed so that no one else has this problem.