Im on window11 and this also effects my xbox version as well, but when i try to download the main world (the middle one of the three worlds offered on realms) it starts to download, then stops and gives me a message saying “An error has occured” and it does this with all previous backups on that particular world. so i cannot back it up. the other two slots (to the left and right) do allow me to download from them. but not my main world.
Environment
Windows 11Pro running on a RTX3090 and on Xbox one X scorpio
Both have same issue.
I am having the same issue, with Windows 11Pro, iOS and Nintendo Switch. Worked fine before the update.