A CloudKit notifications bug in iOS 26.4 breaks real-time iCloud sync for some apps and users. Data isn't lost, but changes will either be delayed or won't appear until you switch apps. A fix is in the iOS 26.5 beta.
@TidBITS The best thing #iOS26 and #iPadOS26 did for me was to force me to seriously consider a #linux lifestyle. Linux is so much better! I’ve probably already purchased my last #Apple device. And I’ve been an Apple user since 1980. This buggy, garbage excuse for as OS is the end for me.