Hi Daver,
Thank you for getting back to me for the update, since your minecraftWorlds folder only contains BootstrapStorage and no actual world data, it means the worlds were likely wiped during the reinstall/reset process. At this point the next step is data recovery because Mojang cannot restore deleted local files automatically.
To address this issue the first thing to do is stop writing any new data to the drive because every new file can overwrite the deleted Minecraft worlds and make recovery impossible.
Next consider using file recovery software such as Recuva, EaseUS Data Recovery or Wondershare Recoverit. These tools can scan for deleted files make sure to install the recovery tool on a different drive not the one where Minecraft is installed and then scan the path:
C:\Users<YourUsername>\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\
Look for folders with random names as those usually represent your world data.
It’s also worth checking OneDrive or any other cloud backup service you might have been using. Review version history and confirm that you are signed in with the same Xbox or Microsoft account since worlds sometimes sync to the cloud.
Another option is to restore previous versions of the folder. Right-click the com.mojang folder, select Properties and check the Previous Versions tab. If File History or System Restore was enabled you may be able to roll back to an earlier state.
For future prevention regularly export your worlds from Minecraft through Settings select Profile select Manage Worlds select Export. Additionally back up the minecraftWorlds folder to OneDrive or an external drive before installing updates.
Best regards,
Marcelo