World can no longer be opened

Hello all,

since a few days I can not open my locally created world (not on realm).

It has been given the default image and grayed out, plus the size has reduced from ~750 MB to 531 MB.
When I try to get in, the "Synchronizing world data..." window opens with the following error message:

"The world was not fully synchronized or was corrupted. Play on a console where the world works fine and start a new migration attempt."

Here's what I've already tried:

• Clearing the cache
• Reinstalling the game (even from a third party device)
• Deleting the game files
• Deleting the alternative MAC address
• and of course various reboots...
   

Gamertag: ReimEvergreen85

Affected world: "Meine Welt" (from 09.03.2023)

 

Is there still a possibility to save the world?

Many greetings

Christian