Since July 25, multiple production users have been unable to load previously saved records from a CloudKit private database. The query uses CKQueryOperation with: Record type: UserAnLi Predicate: category_sub_id == "1401" Sort descriptor: creationDate descending Results limit: 20 The requests consistently fail after approximately 10 seconds with: Error domain: CKErrorDomain Error code: 15 (CKErrorServerRejectedRequest) Underlying error: CKInternalErrorDomain Code=2000 HTTP status: 500 CKErrorRetryAfterKey: absent CKErrorShouldThrottleClient: absent Examples from two different users/devices: iOS 18.3.2 RequestUUID: 67890D6B-8076-4135-9635-7DCCFF38D94F OperationID: A796C6799FA69D66 CloudKit partition: 233 Edge response time: 10024 ms iOS 26.6 RequestUUID: 1249FEAE-9D5A-40CB-9076-DAD2D8396BCF OperationID: CEC87546C31D61E2 CloudKit partition: 227 Edge response time: 10086 ms Users are signed in to iCloud, iCloud Drive is enabled, and general network access works normally. According to TN3162, documented CloudKit throttling normally returns CKErrorServiceUnavailable or CKErrorRequestRateLimited with a retry-after value. These failures instead return CKErrorServerRejectedRequest, HTTP 500, and no retry-after information. The issue has been reported through Feedback Assistant: FB24046201 Could this indicate a production CloudKit query/index problem, a server-side query timeout, or an undocumented/misreported throttle? Is there any client-side mitigation, or does this require investigation by the CloudKit backend team?