NSCloudKitMirroringDelegate "Never successfully initialised" error

After single attempt to fetch context on persistentContainer right after internet was restored (NWPathMonitor update handler), CoreData+CloudKit mirroring stuck and messaging that no internet, and cannot initialise. All CloudKit requests work perfect, but CloudKitMirroring cannot do sync, only app restart helps.
Have no idea how simple fetch can kill CoreData mirroring... It happens each time I fetch on internet restore (I have to do that, to upload parent records to CloudKit manually as Apple did not implemented that in NSPersistentCloudKitContainer, all my records must have parents in order to share them).

2020-07-24 19:36:25.309059+0300 Grocery List[1045:148713] [error] error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate requestAbortedNotInitialized:]1379: <NSCloudKitMirroringDelegate: 0x281e048f0> - Never successfully initialized and cannot execute request '<NSCloudKitMirroringDelegateSerializationRequest: 0x283c6cec0> B20F9DB7-9600-4456-B682-056F4849FE4D resultType: Records resultType: Records

objectIDsToSerialize:

{(

    0xccdeb685a950d0db <x-coredata://D745D081-107C-46B4-BA82-FAF2D86D959C/Item/p100>

)}' due to error: <CKError 0x282671440: "Network Unavailable" (3/NSURLErrorDomain:-1009); "Схоже, що немає інтернет-зʼєднання.">

2020-07-24 19:36:25.309837+0300 Grocery List[1045:148713] [error] error: CoreData+CloudKit: -[NSPersistentCloudKitContainer recordForManagedObjectID:]

block_invoke(253): Record serialization failed with error: Error Domain=NSCocoaErrorDomain Code=134406 "Request 'B20F9DB7-9600-4456-B682-056F4849FE4D' was aborted because the mirroring delegate never successfully initialized due to error: <CKError 0x282671440: "Network Unavailable" (3/NSURLErrorDomain:-1009); "Схоже, що немає інтернет-зʼєднання.">" UserInfo={NSLocalizedFailureReason=Request 'B20F9DB7-9600-4456-B682-056F4849FE4D' was aborted because the mirroring delegate never successfully initialized due to error: <CKError 0x282671440: "Network Unavailable" (3/NSURLErrorDomain:-1009); "Схоже, що немає інтернет-зʼєднання.">}