iCloud features in the iOS 13 betas have been removed because of buggy issues (And is probably a big driver behind iOS 13.1 betas). Developer Craig Hockenberry says this resulted in some unhappy customers.
Entire folders were either gone or corrupted. Apple’s mechanism to recover deleted files was of no help. The customers with weird folder duplicates were the “lucky” ones…Anyone who’s not a developer, and hasn’t been burned by a bad OS, does not know the kind of trouble that lies ahead. It’s irresponsible for Apple to release a public beta with known issues in iCloud…As an Apple shareholder, I also worry about how these failures will damage the iCloud brand.
This is exactly why you don’t run beta software on mission-critical devices. It’s not irresponsible of Apple, it’s irresponsible of people who ignore the warning on beta.apple.com to make backups. These people are why there are “Caution: Product May Be Hot” labels on microwaveable food.