When I use NSPersistentCloudKitContainer to sync data, I receive error Code=134421/134406 Import failed because applying the accumulated changes hit an unhandled exception. iOS/iPadOS 15 beta 5 - iOS/iPadOS 15 beta 7(latest) When this error appears, data can not be import/merged from iCloud. Delete app and reinstall is not working. Same momd on macOS 12(Catalyst, with full data upgrated from macOS 11) works fine. Maybe a system bug? Merge Policy: context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy context.automaticallyMergesChangesFromParent = true Console log here: CoreData: error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _requestAbortedNotInitialized:](1826): <NSCloudKitMirroringDelegate: 0x282f3c180> - Never successfully initialized and cannot execute request '<NSCloudKitMirroringExportRequest: 0x2815d8180> B7974D4D-C5DA-413E-AE3B-072C88D38D47' due to error: Error Domain=NSCocoaErrorDomain Code=134421 "Import failed because applying the accumulated changes hit an unhandled exception." UserInfo={NSLocalizedFailureReason=Import failed because applying the accumulated changes hit an unhandled exception., NSUnderlyingException=*** NSAllocateMemoryPages(103626821) failed} CoreData: CloudKit: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _finishedRequest:withResult:](2713): Finished request: <NSCloudKitMirroringExportRequest: 0x2815d8180> B7974D4D-C5DA-413E-AE3B-072C88D38D47 with result: <NSCloudKitMirroringResult: 0x281b51060> success: 0 madeChanges: 0 error: Error Domain=NSCocoaErrorDomain Code=134406 "Request 'B7974D4D-C5DA-413E-AE3B-072C88D38D47' was aborted because the mirroring delegate never successfully initialized due to error: Error Domain=NSCocoaErrorDomain Code=134421 "Import failed because applying the accumulated changes hit an unhandled exception." UserInfo={NSLocalizedFailureReason=Import failed because applying the accumulated changes hit an unhandled exception., NSUnderlyingException=*** NSAllocateMemoryPages(103626821) failed}" UserInfo={NSLocalizedFailureReason=Request 'B7974D4D-C5DA-413E-AE3B-072C88D38D47' was aborted because the mirroring delegate never successfully initialized due to error: Error Domain=NSCocoaErrorDomain Code=134421 "Import failed because applying the accumulated changes hit an unhandled exception." UserInfo={NSLocalizedFailureReason=Import failed because applying the accumulated changes hit an unhandled exception., NSUnderlyingException=*** NSAllocateMemoryPages(103626821) failed}}