[firebase_database]: Issue on web debug mode when listening to multiple onValue streams on the same path

Is there an existing issue for this?

[X] I have searched the existing issues.

Which plugins are affected?

Database

Which platforms are affected?

Web

Description

Listening to the same path multiple times will only return a result to the latest stream. However it must return a result to all streams i.e stream 1 & stream 2 print statements must get displayed.

This issue is present on web platform in DEBUG mode. The console display the following:

got stream 3 with value:null
got stream 3 with value:1
got stream 3 with value:2

When running in RELEASE mode there is no issue. The chrome console displays the following:

got stream 1 with value:2 js_primitives.dart:42 
got stream 2 with value:2 js_primitives.dart:42
got stream 3 with value:2 js_primitives.dart:42 
got stream 1 with value:3 js_primitives.dart:42 
got stream 2 with value:3 js_primitives.dart:42 
got stream 3 with value:3 js_primitives.dart:42 
got stream 1 with value:4 js_primitives.dart:42 
got stream 2 with value:4 js_primitives.dart:42 
got stream 3 with value:4 js_primitives.dart:42

Lastly this worked fine in firebase_database 10.5.0 with firebase_core: 2.28.0 but is now broken in firebase_database: 11.0.4 with firebase_core 3.3.0.

Reproducing the issue

Run the code sample & increment the counter:

import 'dart:async';

import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:flutter/material.dart';

import 'firebase_options.dart';

void main() async {
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  // returns the counter value
  Stream<int?> _getCounterValue() {
    return FirebaseDatabase.instance
        .ref()
        .child('/counter')
        .onValue
        .map((event) {
      final result = event.snapshot.value;
      return result as int?;
    });
  }

  int _counter = 0;

  // streams to listen to counter value
  StreamSubscription<int?>? _stream1, _stream2, _stream3;

  @override
  void initState() {
    super.initState();
    _stream1 = _getCounterValue().listen((value) {
      print('got stream 1 with value:$value');
      _updateCounter(value);
    });
    _stream2 = _getCounterValue().listen((value) {
      print('got stream 2 with value:$value');
      _updateCounter(value);
    });
    _stream3 = _getCounterValue().listen((value) {
      print('got stream 3 with value:$value');
      _updateCounter(value);
    });
  }

  void _updateCounter(int? value) {
    if (!mounted) return;
    setState(() => _counter = value ?? 0);
  }

  void _incrementCounter() {
    _counter++;
    FirebaseDatabase.instance.ref().child('/counter').set(_counter);
  }

  @override
  void dispose() {
    _stream1?.cancel();
    _stream2?.cancel();
    _stream3?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

Firebase Core version

3.3.0

Flutter Version

3.19.6

Relevant Log Output

Launching lib/main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...
This app is linked to the debug service: ws://127.0.0.1:64942/82TkgPvGJ0s=/ws
Debug service listening on ws://127.0.0.1:64942/82TkgPvGJ0s=/ws
Debug service listening on ws://127.0.0.1:64942/82TkgPvGJ0s=/ws
got stream 3 with value:null
got stream 3 with value:1
got stream 3 with value:2

Flutter dependencies

Expand Flutter dependencies snippet

```yaml Dart SDK 3.3.4 Flutter SDK 3.19.6 web_debug_mode_issue 1.0.0+1 dependencies: - cupertino_icons 1.0.8 - firebase_core 3.3.0 [firebase_core_platform_interface firebase_core_web flutter meta] - firebase_database 11.0.4 [firebase_core firebase_core_platform_interface firebase_database_platform_interface firebase_database_web flutter] - flutter 0.0.0 [characters collection material_color_utilities meta vector_math sky_engine] dev dependencies: - flutter_lints 3.0.2 [lints] - flutter_test 0.0.0 [flutter test_api matcher path fake_async clock stack_trace vector_math leak_tracker_flutter_testing async boolean_selector characters collection leak_tracker leak_tracker_testing material_color_utilities meta source_span stream_channel string_scanner term_glyph vm_service] transitive dependencies: - _flutterfire_internals 1.3.40 [collection firebase_core firebase_core_platform_interface flutter meta] - async 2.11.0 [collection meta] - boolean_selector 2.1.1 [source_span string_scanner] - characters 1.3.0 - clock 1.1.1 - collection 1.18.0 - fake_async 1.3.1 [clock collection] - firebase_core_platform_interface 5.2.0 [collection flutter flutter_test meta plugin_platform_interface] - firebase_core_web 2.17.4 [firebase_core_platform_interface flutter flutter_web_plugins meta web] - firebase_database_platform_interface 0.2.5+40 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface] - firebase_database_web 0.2.5+12 [collection firebase_core firebase_core_web firebase_database_platform_interface flutter flutter_web_plugins] - flutter_web_plugins 0.0.0 [flutter characters collection material_color_utilities meta vector_math] - leak_tracker 10.0.0 [clock collection meta path vm_service] - leak_tracker_flutter_testing 2.0.1 [flutter leak_tracker leak_tracker_testing matcher meta] - leak_tracker_testing 2.0.1 [leak_tracker matcher meta] - lints 3.0.0 - matcher 0.12.16+1 [async meta stack_trace term_glyph test_api] - material_color_utilities 0.8.0 [collection] - meta 1.11.0 - path 1.9.0 - plugin_platform_interface 2.1.8 [meta] - sky_engine 0.0.99 - source_span 1.10.0 [collection path term_glyph] - stack_trace 1.11.1 [path] - stream_channel 2.1.2 [async] - string_scanner 1.2.0 [source_span] - term_glyph 1.2.1 - test_api 0.6.1 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph] - vector_math 2.1.4 - vm_service 13.0.0 - web 0.5.1 ```

Additional context and comments

This issue has been reported previously here. I also added a comment to that issue. However the issue was locked.

So I have opened a new issue with sample code to reproduce it.

firebase / flutterfire