HiveList relationships are not updated properly

After updating an object in the box that is used in the hive list of other objects, it will be removed from the hive list until I make a Hot Restart of the app. The expected result if I update the object then it will be updated in HiveList of other objects.

```dart
import 'package:flutter/material.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:path_provider/path_provider.dart';

part 'reproducible_example.g.dart';

/// Instructions:
/// 1. Run main()
/// 2. Press "Add a new user"
/// 3. Make Hot Reload
/// 4. You now have: Bob[Instance of 'Friend]
/// 5. Press "Update a friend"
/// 6. Make Hot Reload
/// 7. "Bob[Instance of 'Friend]" will become "Bob[]"
/// "Friend" will become "New Friend"
///
/// Expected result:
/// "Bob[Instance of 'Friend']" will become "Bob[Instance of 'Friend']"
/// "Friend" will become "New Friend"
///
/// Notes:
/// If you make a hot restart of the app everything works as expected.
/// But it should work without hot restart.
///
/// Packages:
/// 1. hive: ^2.0.5
/// 2. hive_flutter: ^1.1.0
/// 3. hive_generator: ^1.1.2
/// 4. build_runner: ^2.1.7

final userBox = Hive.box('users');
final friendBox = Hive.box('friends');

Future main() async {
WidgetsFlutterBinding.ensureInitialized();
final directory = await getApplicationDocumentsDirectory();
Hive.init(directory.path);
Hive.registerAdapter(UserAdapter());
Hive.registerAdapter(FriendAdapter());
await Hive.openBox('users');
await Hive.openBox('friends');
if (friendBox.isEmpty) {
await friendBox.add(Friend('Friend'));
}
runApp(const Home());
}

@HiveType(typeId: 0)
class User extends HiveObject {
User(this.name, this.friends);

@HiveField(0)
final String name;
@HiveField(1)
final HiveList friends;
}

@HiveType(typeId: 1)
class Friend extends HiveObject {
Friend(this.name);

@HiveField(0)
final String name;
}

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

@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Row(),
const Text('Users:'),
...userBox.values.map((user) {
return Text(user.name + user.friends.toString());
}).toList(),
const Text('Friends:'),
...friendBox.values.map((friend) {
return Text(friend.name);
}).toList(),
TextButton(
onPressed: () {
final friends = HiveList(
friendBox,
objects: [friendBox.values.first],
);

userBox.add(
User('Bob', friends),
);
},
child: const Text('Add a new user'),
),
TextButton(
onPressed: () {
friendBox.put(0, Friend('New Friend'));
},
child: const Text('Update a friend'),
),
],
),
),
);
}
}

```