iCloud documents gone following update

I'm on macOS 10.15 Dev Beta 8. iPad is running iOS 13 Dev Beta 8.

My documents folders (Keynote, Pages, iMovie, etc) in the root iCloud Drive folder are all missing. Usually I'd pencil it in as a delayed sync post-update, but I've checked my iPad and they're missing there too. iCloud.com shows the files being there, in the correct place.

Why would both my iPad and my Mac be missing the folders if iCloud.com seems to think they're there?

Does anyone have an experience like this?

That is normal and documented by Apple. (yes it is a known bug, but you didn't lost anything. They were all moved to your iCloud under Documents and/or Desktop folders.

You have to download them from iCloud again

If you want to change settings:

Change this setting under System Preferences -> iCloud (save "Documents and Desktop" on iCloud.

but this "problem" of missing just happens on Upgrade. If you like you can continuing syncing Documents and Desktop to iCloud. It is just that you will have to download them at least once, now.