GoRouter issue with deep links

main.dart

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';

// 1. The main file
void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(routerConfig: goRouter);
  }
}

// 2. The GoRouter configuration
final goRouter = GoRouter(
  debugLogDiagnostics: kDebugMode,
  routes: [
    GoRoute(
      path: '/',
      builder: (context, state) => const SplashScreen(),
    ),
    GoRoute(
      path: '/home',
      builder: (context, state) => const HomeScreen(),
    ),
    GoRoute(
      path: '/deeplink',
      builder: (context, state) => const DeepLinkScreen(),
    ),
    GoRoute(
      path: '/child',
      builder: (context, state) => const ChildScreen(),
      redirect: (context, GoRouterState state) {
        final valueAddedDuringDeepLink = state.uri.queryParameters['value'];
        if (valueAddedDuringDeepLink == '42') {
          return null;
        } else {
          return '/deeplink';
        }
      },
    ),
  ],
);

// 3. The 4 screens

// 3.1 Splash screen
class SplashScreen extends StatefulWidget {
  const SplashScreen({super.key});

  @override
  State<SplashScreen> createState() => _SplashScreenState();
}

class _SplashScreenState extends State<SplashScreen> {
  @override
  void initState() {
    super.initState();
    Future.delayed(const Duration(seconds: 1), () {
      context.go('/home');
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Splash screen')),
      body: const Center(
          child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Text('Loading...'),
          CircularProgressIndicator(),
        ],
      )),
    );
  }
}

// 3.2 Home screen
class HomeScreen extends StatelessWidget {
  const HomeScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Home screen')),
      body: Center(
          child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          const Text('Home'),
          TextButton(
            onPressed: () => context.push('/child'),
            child: const Text('Go to child screen'),
          ),
        ],
      )),
    );
  }
}

// 3.3 Deep link screen
class DeepLinkScreen extends StatefulWidget {
  const DeepLinkScreen({super.key});

  @override
  State<DeepLinkScreen> createState() => _DeepLinkScreenState();
}

class _DeepLinkScreenState extends State<DeepLinkScreen> {
  @override
  void initState() {
    super.initState();

    Future.delayed(const Duration(seconds: 1), () {
      context.pushReplacement('/child?value=42');
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(title: const Text('Deep link screen')),
        body: const Center(
            child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text('Redirecting to the child screen...'),
            CircularProgressIndicator(),
          ],
        )));
  }
}

// 3.4 Child screen
class ChildScreen extends StatelessWidget {
  const ChildScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Child screen')),
      body: const Center(child: Text('Child')),
    );
  }
}