I am also having same issue not using SwiftUI. Simple swift app with CoreData and CloudKit auto syncing option turn on.
<NSCloudKitMirroringResult: 0x600000268fa0> success: 0 madeChanges: 0 error: Error Domain=NSCocoaErrorDomain Code=134417 "Request '<NSCloudKitMirroringImportRequest: 0x600000cc10e0> 1A57C80D-0BAE-4E9A-BF8C-41F695ECE8A1' was cancelled because there is already a pending request of type 'NSCloudKitMirroringImportRequest'." UserInfo={NSLocalizedFailureReason=Request '<NSCloudKitMirroringImportRequest: 0x600000cc10e0> 1A57C80D-0BAE-4E9A-BF8C-41F695ECE8A1' was cancelled because there is already a pending request of type 'NSCloudKitMirroringImportRequest'.}
majidpk
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I am also having the same issue in macOS app.