July Clover, writing for MacRumors January 24, 2022
A number of developers are upset with an increasingly problematic iCloud server issue that is causing some apps that have implemented iCloud support to fail to sync properly.
Multiple developers have reported the iCloud syncing bug to Apple, but it has gone widely unaddressed based on the number of complaints and the fact that the issue has seemingly persisted for at least the last couple of months. It’s likely that the problem popped up with the launch of iOS 15 and its sister updates, and it’s not clear when a fix might be available.
Customers experiencing iCloud issues should be aware that it’s likely an issue on Apple’s end and not a bug that app developers can address at this time.
Additional reading on the subject: Michael Tsai – Blog – Increased iCloud Errors