navigatorObservers reporting a unknow route

Version

5.2.1

What platforms are you seeing the problem on?

No response

What happened?

I've set a NavigatorConfig.initialRoute for my tabs along with navigatorObservers. All tabs have an initialRoute other than "/". However, my AnalyticsNavigatorObserver.didPush is being called to the '/' route. Where is this coming from?

Steps to reproduce

Just run the code

Code to reproduce the problem

import 'package:flutter/material.dart';
import 'package:persistent_bottom_nav_bar_v2/persistent_bottom_nav_bar_v2.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) => MaterialApp(
    title: 'Flutter Demo',
    home: const MyHomePage(),
  );
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

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

class _MyHomePageState extends State<MyHomePage> {

  @override
  Widget build(BuildContext context) => PersistentTabView(
    navBarHeight: 48,
    tabs: [
      PersistentTabConfig(
        screen: const ScreenPage(title: "Home", contentMessage: "Home"),
        item: ItemConfig(
          icon: Icon(Icons.home),
          title: "Home",
        ),
        navigatorConfig: NavigatorConfig(
          initialRoute: "/tab_home/first",
          navigatorObservers: [AnalyticsNavigatorObserver()],
        ),
      ),
      PersistentTabConfig(
        screen: const ScreenPage(title: "Messages", contentMessage: "Messages"),
        item: ItemConfig(
          icon: Icon(Icons.message),
          title: "Messages",
        ),
        navigatorConfig: NavigatorConfig(
          initialRoute: "/tab_messages/first",
          navigatorObservers: [AnalyticsNavigatorObserver()],
        ),
      ),
      PersistentTabConfig(
        screen: const ScreenPage(title: "Settings", contentMessage: "Settings"),
        item: ItemConfig(
          icon: Icon(Icons.settings),
          title: "Settings",
        ),

        navigatorConfig: NavigatorConfig(
          initialRoute: "/tab_settings/first",
          navigatorObservers: [AnalyticsNavigatorObserver()],
        ),
      ),
    ],
    handleAndroidBackButtonPress: false,
    backgroundColor: Theme.of(context).colorScheme.background,
    navBarBuilder: (config) => Style2BottomNavBar(navBarConfig: config),
  );
}

class ScreenPage extends StatelessWidget {
  final String title;
  final String contentMessage;

  const ScreenPage({super.key, required this.title, required this.contentMessage});

  @override
  Widget build(BuildContext context) => Scaffold(
    appBar: AppBar(
      title: Text(title),
    ),
    body: Center(
      child: Text(contentMessage),
    ),
  );
}

class AnalyticsNavigatorObserver extends NavigatorObserver {

  @override
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
    print("didPush");
    print("new route: ${route.settings.name}");
    print("previous route: ${previousRoute?.settings.name}");
    print("------------------------------------------------");
  }

  @override
  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
    print("didPop");
    print("new route: ${route.settings.name}");
    print("previous route: ${previousRoute?.settings.name}");
    print("------------------------------------------------");
  }

  @override
  void didRemove(Route<dynamic> route, Route<dynamic>? previousRoute) {
    print("didRemove");
    print("new route: ${route.settings.name}");
    print("previous route: ${previousRoute?.settings.name}");
    print("------------------------------------------------");
  }

  @override
  void didReplace({Route<dynamic>? newRoute, Route<dynamic>? oldRoute}) {
    print("didReplace");
    print("new route: ${newRoute?.settings.name}");
    print("previous route: ${oldRoute?.settings.name}");
    print("------------------------------------------------");
  }
}

Relevant log output

I/flutter (10230): didPush
I/flutter (10230): new route: / <<<< ??????????
I/flutter (10230): previous route: null

Screenshots