when FirebaseMessaging.onBackgroundMessage initialize in main, javaScriptChannel doesn't listen on Android

[bartukaan]

When I initialize FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler) in main function,
webview javaScriptChannel doesnt listen any event on Android, but ios working well.
Anyone encountering this error?
Is there any idea for that situtation?

[bartukaan]

[√] Flutter (Channel stable, 2.5.3, on Microsoft Windows [Version 10.0.19043.1348], locale en-US)
• Flutter version 2.5.3 at C:\src\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 18116933e7 (6 weeks ago), 2021-10-15 10:46:35 -0700
• Engine revision d3ea636dc5
• Dart version 2.14.4

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
• Android SDK at C:\Users\Bartu\AppData\Local\Android\sdk
• Platform android-31, build-tools 30.0.2
• Java binary at: E:\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
• All Android licenses accepted.

[√] Chrome - develop for the web
• Chrome at C:\Users\Bartu\AppData\Local\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 2020.3)
• Android Studio at E:\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[√] Connected device (3 available)

flutter_webview_plugin: ^0.4.0 ( but I use edited version in my repo )

flutter_webview_plugin:
git:
url: https://github.com/bartukaan/flutter_webview_plugin.git
ref: master

firebase_messaging: ^11.1.0

Future main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);
....
}

WebviewScaffold(
allowFileURLs: true,
resizeToAvoidBottomInset: true,
key: key,
appBar: appBar(args),
ignoreSSLErrors: true,
url: args.fetchUrl!,
withLocalStorage: true,
withJavascript: true,
debuggingEnabled: true,
javascriptChannels: Set.from([
JavascriptChannel(
name: 'TEST',
onMessageReceived: _onJSMsgRecv,
),
]),
initialChild: Container(
color: Colors.white,
child: Center(
child: CupertinoActivityIndicator(radius: 30),
),
),
),
_onJSMsgRecv doesnt listen any event on Android. When I initialize FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler) in main function,

[bartukaan]

any idea?