Puzzling Ventura file structure

I just updated from Monterey to Ventura and I'm puzzled by what I see in ~/Library/Containers.

Every single folder in "Containers" contains the same "Data" sub-folder, and that Data sub-folder contains the same following sub-folders: Desktop, Documents, Downloads, Library, Movies, Music, Pictures, System Data, tmp.

Also in "Containers" there are several instances of the same folders, like 2 Books folders, 6 Mail folders, 6 Messages folders, etc.

What's going on?