I have an Xbox One and my world was created after the bedrock changeover, I bought an Xbox one X as the release of the Aquatic update pt.1 came out. After transferring everything over to the Xbox one X when I start the game my worlds don’t sync in from the cloud, there are no worlds at all as if your starting the game from new, I also noticed a world on the Xbox one after the update that I didn’t create, survival created 01/01/1970 and is 0.01 mb, I deleted it but then my world kept getting the ‘save doesn’t match’ message ‘console or cloud’ where you have to choose one, but the cloud said “Xbox live no data” as I back up my world I deleted the world with the issue and played on the backup, everything was fine after that but the unknown survival world appeared again. Because my worlds won’t transfare to the Xbox one X I created a new world on the Xbox one X called ‘test’ and everything was fine, but now I have 2 of the unknown survival worlds when I go on the Xbox One, still world transfare won’t work to Xbox one X. I have tried deleting and reloading minecraft but that never resolved the issue. On both consoles they are v1.4.2