System back navigation minimizing the android app (Flutter) with PopScope

I am new to Flutter and I am having a an issue on my Flutter app.

Navigator.pop(context); is not working with the android system back navigation button press. When I use a custom button on the screen and pop, it’s navigate back without any issue, but when I use the system back navigation pressed, app gets minimized instead of navigate back.

I would like to know what I am doing wrong.

Setup,

• Running on Android 14 emulator.
• Flutter 3.24.2
• Dart 3.5.2
• DevTools 2.37.2

on AndroidManifest.xml enabled enableOnBackInvokedCallback too

       <activity
            android:requestLegacyExternalStorage="true"
            android:usesCleartextTraffic="true"
            android:name=".MainActivity"
            android:exported="true"
            android:launchMode="singleTop"
            android:taskAffinity=""
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize"
            android:enableOnBackInvokedCallback="true">

An example of my implementation

  void _onBackPressed() {
    Navigator.pop(context);
  }
  
  Widget build(BuildContext context) {
    return PopScope(
      canPop: false,
      onPopInvokedWithResult: (didPop, result) {
        if (didPop) return;
 
        _onBackPressed();
        // print('navigate_back : $didPop --- $result');
      },
      child: Scaffold(
        appBar: CommonHeader(
          isWP: false,
          titleText: AppStrings.beCalm,
          onBackPressed: _onBackPressed,
        ),
        body: Container(
         

Back navigation from CommonHeader model is working, and system back button press is not working.

Looking for your help to identify the issue.
Thanks in advance