FYI: this is Local Play.
I just went through my backups and figured out when this happened.
On Nov 6. 2023 I manually updated Minecraft in the MS Store APP from 1.20.32 to 1.20.41 . I had previously stopped auto updates because of recent updates making play more difficult (not more fun): curing - and I want to control when those types of changes take affect (sorry for the Wine).
My backup from Nov. 5, 2023 does not have these chests split. My backup from Nov. 6, 2023 DOES!
I backup almost everyday or after a decent accomplishment. I backup by:
"fully" closing the program
copying the World Folder to a dated folder well outside the Packages folder. I.E. To: %userProfile%\Documents\Backup\Minecraft\Worlds\yyyy-mm-dd-iterationNumber
Restore is basically the reverse:
Fully close the program
Delete the Live folder
copy the backup folder to the Live location
Thanks
Dan
Just dawned on me that you might also want the Nov 5 backup (before the upgrade and when the chests were fine).
https://gofile.me/6VE7c/ALlHp0MW3