Navigator resets when inspector is used to select widget

main.dart

import 'package:flutter/material.dart';

void main() => runApp(X());

class X extends StatelessWidget {
  const X({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      builder: (context, child) {
        return Navigator(
          onPopPage: (route, dynamic result) {
            return route.didPop(result);
          },
          pages: [
            MaterialPage<void>(
              child: FirstPage(),
            ),
          ],
        );
      },
    );
  }
}

class FirstPage extends StatelessWidget {
  const FirstPage({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Center(
      child: GestureDetector(
        child: Text('1'),
        onTap: () => Navigator.of(context).push<void>(
          MaterialPageRoute(
            builder: (context) {
              return const Text('2');
            },
          ),
        ),
      ),
    );
  }
}