Firebase Messaging unregister notification for read_timeout failed

Question

I was trying to send a notification from one device to another device to let the user know there is a waiting message for him.

When I was trying to catch and handle the RemoteMessage this is what console prints. It happens on iOS physical devices.

That function works perfectly before but now it is impossible to send notification to other user over the device, client side.

Function overview:

  static Future<void> sendNotificationToOtherUser(
      String title, String body, String token) async {
    final headers = {
      'content-type': 'application/json',
      'Authorization':
          'key={I hide KEY but I assure you there is nothing wrong with key}'
    };
    List<String> list = List();
// token is not null
    list.add(token);
    final postUrl = 'https://fcm.googleapis.com/fcm/send';
    final data = {
      "registration_ids": list,
      "notification": {
        "title": '$title',
        "body": '$body',
      },
    };

    final response = await http.post(Uri.parse(postUrl),
        body: json.encode(data),
        encoding: Encoding.getByName('utf-8'),
        headers: headers);

    if (response.statusCode == 200) {
      // it prints 200 so works perfectly
      print(response.body);
      print('test ok push CFM');
      return true;
    } else {
      print(response.body);
      print(' CFM error');
      // on failure do sth
      return false;
    }
  }

It seems everything works but other device cannot catch Notification and shows it due to error I put below. Error:

[connection] nw_endpoint_handler_set_adaptive_read_handler [C6.1 216.58.212.42:443 ready channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4, dns)] unregister notification for read_timeout failed
[connection] nw_endpoint_handler_set_adaptive_write_handler [C6.1 216.58.212.42:443 ready channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4, dns)] unregister notification for write_timeout failed

Libraries:

  firebase_core: ^1.0.3
  firebase_auth: ^1.0.2
  cloud_firestore: ^1.0.4
  firebase_storage: ^8.0.1
  firebase_messaging: ^10.0.0

Flutter SDK version:

[✓] Flutter (Channel stable, 2.2.2, on macOS 11.4 20F71 darwin-x64, locale
    en-GB)
    • Flutter version 2.2.2 at /Users/user/development/flutter
    • Framework revision d79295af24 (4 weeks ago), 2021-06-11 08:56:01 -0700
    • Engine revision 91c9fc8fe0
    • Dart version 2.13.3