Player Coordinates, Levels, Inventory and Ender Chest lost in world backup

After downloading a Realms backup and loading it as a single player world using the same account (Operator) on the same computer (Windows 11), the player's coordinates, inventory and ender chest contents are lost.

This results in:

• The player being placed at 0, 0 (and in my case, suffocating in block)
• Any levels being lost
• All items from inventory missing
• Ender chest contents missing

Stats and achievements however appear to remain correct.

 

Expected Behavior

Player data should remain in-tact when loading the backup as a Single Player world.

 

Steps to reproduce:

1. Create a world on Realms
2. Put items in inventory and ender chest
3. Gain levels
4. Disconnect and wait for backup to occur
5. Download backup
6. Load backup as a single player world
   At this point you should see the same issues described above

Notes

• My world has been around for a year or two and has been updated a few times.
• I have not tried messing around with data files in the playerdata folder but I do see a data file present for my UUID
• I have not yet migrated my Realms.  Was trying to do a backup before doing so and discovered this issue.

Edit

On further review of the player data files using a 3rd-party NBT viewer, I've discovered that my player data file (based on UUID) is indeed with a clear inventory.  However, in the backup download, there was a "dat_old" version of the file that DID contain my inventory details.

I tried renaming the dat_old to dat, but after loading the world in Single Player, it wiped out the data again.

It appears that when a backup is made, the current playerdata files are renamed to dat_old and new ones are created, effectively wiping any existing data.

I've attached both files (with the UUID replaced with "playerdata") here for review.