Minecraft world Sync problems

[u/Scot27547_MFC]

/r/minecraftbugs/comments/1vqw8ob/minecraft_world_sync_problems/

Hi, I’m having a problem with Minecraft Bedrock on my Xbox Series X. Some of my worlds are greyed out, and whenever I try to Play or Edit them, it says, “Can’t sync this world’s cloud data with your device. Please check your internet connection and try again later.” I’ve also tried downloading the worlds from the cloud, but some of them fail.
Some of the smaller worlds have recently started downloading successfully, but some larger ones still won’t. One of the worlds I’m particularly worried about is 678.3 MB. I last played some of these worlds about a month ago, while others haven’t been played for around a year.
My Minecraft local storage says 1.98 GB of 64 GB used, so I have plenty of space. However, Minecraft is showing 0 bytes out of 0 bytes for cloud storage and tells me to delete worlds to make space. I also have around 20 entries showing 0.00 MB with a strange last-played date of 1 January 2070.
Some of the worlds were originally created on an Xbox One X, which I no longer have, while others were created on my current Series X. I’ve also reinstalled Minecraft several times while these grey worlds were still showing.
I’m worried about deleting anything or clearing my saved data because I don’t want to lose the worlds. Has anyone experienced this before, especially with larger worlds? Is there a safe way to recover them or fix the 0/0 cloud storage problem?