无法使用streambuilder从firestore flutter获取数据，路径正确，但仍显示空数据

import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Firestore StreamBuilder Example'),
        ),
        body: FirestoreStreamBuilder(),
      ),
    );
  }
}

class FirestoreStreamBuilder extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<QuerySnapshot>(
      stream: FirebaseFirestore.instance.collection('yourCollection').snapshots(),
      builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
        if (snapshot.hasError) {
          return Text('Something went wrong');
        }

        if (snapshot.connectionState == ConnectionState.waiting) {
          return Text("Loading");
        }

        return ListView(
          children: snapshot.data!.docs.map((DocumentSnapshot document) {
            Map<String, dynamic> data = document.data() as Map<String, dynamic>;
            return ListTile(
              title: Text(data['title']),
            );
          }).toList(),
        );
      },
    );
  }
}