if(FirebaseAuth.instance.isSignInWithEmailLink(link.toString())) is always false

[ChkBuk]

In my flutter android app, I have used firebase for authentication(Passwordless Authentication) and it sends email links perfectly to the given email address through the android emulator. Email link is similar as follows,
https://fir-login-6f7da.firebaseapp.com/__/auth/action?apiKey=AIzaSyDlX7iyKLvh87ZrHgWLxvCjCtkTjXUeSm8&mode=signIn&oobCode=c9JvCxJbZyoPGRwhjAZmCTENDe-3aSnVZ3hxH8BRG0IAAAF5TvSkOA&continueUrl=https://mydynamic.page.link/V5Hh&lang=en
However, after clicking the link it redirects to the mobile app but does not handle isSignInWithEmailLink method. Because if(FirebaseAuth.instance.isSignInWithEmailLink(link.toString())) is always false.

 @override
  void didChangeAppLifecycleState(AppLifecycleState state) async {
    if (state == AppLifecycleState.resumed) {
      final PendingDynamicLinkData data =
          await FirebaseDynamicLinks.instance.getInitialLink();

      if (data?.link != null) {
        _handleLink(data?.link);
      }
      FirebaseDynamicLinks.instance.onLink(
          onSuccess: (PendingDynamicLinkData dynamicLink) async {
        final Uri deepLink = dynamicLink?.link;
        _handleLink(deepLink);
      }, onError: (OnLinkErrorException e) async {
        print('onLinkError');
        print(e.message);
      });
    }
  }


 void _handleLink(Uri link) async {
    try {print('==================1===================$link');
      if (_auth.isSignInWithEmailLink(link.toString())) {
        print('===================2==================');
        final User user = (await _auth.signInWithEmailLink(
          email: _userEmail,
          emailLink: link.toString(),
        ))
            .user;print('===================3==================$user');
        if (user != null) {
          setState(() {
            _loginEmail = user.email;
            _success = true;
          });
        } else {
          setState(() {
            _success = false;
          });
        }
      } else {
        setState(() {
          _success = false;
        });
      }

    } on PlatformException catch (e) {
      if (e.code == 'ERROR_INVALID_ACTION_CODE') {
        _success = false;
        _errorMsg = 'Email link has been expired. Try again';
      }
    } catch (e) {
      print(e);
    }
    setState(() {});
  }

In the console, it prints like
==================1===================https://mydynamic.page.link/V5Hh
I am wondering why it should not print the whole email link (https://fir-login-6f7da.firebaseapp.com/__/auth/action?apiKey=AIzaSyDlX7iyKLvh87ZrHgWLxvCjCtkTjXUeSm8&mode=signIn&oobCode=c9JvCxJbZyoPGRwhjAZmCTENDe-3aSnVZ3hxH8BRG0IAAAF5TvSkOA&continueUrl=https://mydynamic.page.link/V5Hh&lang=en)
As per the implementation of isSignInWithEmailLink in Firebase, it only 'true' if the email link contains the following texts. Can anybody help me to solve this issue?

bool isSignInWithEmailLink(String emailLink) {
    assert(emailLink != null);
    return (emailLink.contains('mode=signIn') ||
            emailLink.contains('mode%3DsignIn')) &&
        (emailLink.contains('oobCode=') || emailLink.contains('oobCode%3D'));
  }

flutter doctor -v

[√] Flutter (Channel stable, 2.0.6, on Microsoft Windows [Version 10.0.19041.928], locale en-US)
    • Flutter version 2.0.6 at C:\src\flutter
    • Framework revision 1d9032c7e1 (9 days ago), 2021-04-29 17:37:58 -0700
    • Engine revision 05e680e202
    • Dart version 2.12.3

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\Madusha\AppData\Local\Android\Sdk
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = C:\Users\Madusha\AppData\Local\Android\Sdk
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 4.1.0)
    • Android Studio at C:\Program Files\Android\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 11.0.8+10-b944.6842174)

[√] VS Code (version 1.56.0)
    • VS Code at C:\Users\Madusha\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.22.0

[√] Connected device (3 available)
    • AOSP on IA Emulator (mobile) • emulator-5554 • android-x86    • Android 9 (API 28) (emulator)
    • Chrome (web)                 • chrome        • web-javascript • Google Chrome 90.0.4430.93
    • Edge (web)                   • edge          • web-javascript • Microsoft Edge 90.0.818.51

• No issues found!

pubspec.yaml
dependencies:
  flutter:
    sdk: flutter
  firebase_core: ^0.7.0
  firebase_analytics: ^7.0.1
  firebase_auth: ^0.20.1
  firebase_dynamic_links: ^0.7.0+1
  google_fonts: ^1.0.0
  google_sign_in: 4.0.7
  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.1