I have a super flat that has been used for years, it crashed some time ago and has been buggy ever since. Upon saving it would sometimes have a pop up message that it had failed to save but would quickly disappear as if it has infact now saved. It would also look fine on returning.

Recently I have bought the Xbox series x and tried to access this world via the new console however this world will not load. Sometimes it’s there to pick from but won’t actually load. Sometimes it’s been replaced with a world that’s not been opened since 01/01/1970.

Even any duplicates of this world will not sync.

But all other worlds work perfectly fine and upon returning to my Xbox one the world loads fine.