Receiving the root record from CKShare.Metadata

I am working with sharing data through CloudKit and Core Data. I share NSManagedObjects, using:

    persistentContainer.share([object], to: nil) { sharedIDs, s, container, error in
        if let error = error {
            fatalError(error.localizedDescription)
        }
        if let share = s {
            completion(share)
        }
    }

and that works. However, when I would like to receive the CKShare's object, using:

let operation = CKFetchShareMetadataOperation(shareURLs: [shareURL])
operation.shouldFetchRootRecord = true
    
var cache = [CKShare.Metadata]()
    
    operation.perShareMetadataResultBlock = { url, result in
        switch result {
        case .failure(let error):
            print("\(#function) Error during downloading the metadata for \(url.absoluteString): ", error.localizedDescription)
        case .success(let metadata):
            cache.append(metadata)
        }
    }
            
    operation.fetchShareMetadataResultBlock = { result in
        switch result {
        case .failure(let error):
            completion(.failure(error))
        case .success(_):
            completion(.success(cache))
        }
    }
    
    operation.qualityOfService = .userInitiated
    CKContainer.default().add(operation)

The metadata's rootRecord is always nil. In the Apple's documentation we can read:

For a shared record hierarchy, the hierarchicalRootRecordID property contains the ID of the share’s root record. When using CKFetchShareMetadataOperation to fetch metadata, you can include the entire root record by setting the operation’s shouldFetchRootRecord property to true (...). This functionality isn’t applicable for a shared record zone because, unlike a shared record hierarchy, it doesn’t have a nominated root record (https://developer.apple.com/documentation/cloudkit/ckshare/metadata).

Is there a different way to get the shared object from CKShare?