I experienced exactly the same. Interestingly, in about a month ago, everything sync as expected, it's not until recent few weeks that SwiftUI + CoreData + CloudKit no longer sync even after a long period of time. I tested both my old projects and Xcode's SwiftUI template(after adding necessary steps like enable CloudKit, etc). I can confirm your findings, that it no longer seems to sync in a reasonable amount of time.

This issue is bugging me from time to time. Had to delete the app more than 10 times. Anyone knows how to fix it permanently?

Wondering the same

encountered same issue, anyone solved it?

Same here