Problem in flutter local notification grouping - flutter

Question

I'm using flutter_local_notification to rended the incoming chat notifications from FCM trying to group messsages from one conversation. The grouping working properly but on receiving a new notification from a different conversation, it overrides and dismiss the previous group.
showNotification({
required int id,
required AndroidNotificationChannel channel,
required String title,
required String body,
required Map<String, dynamic> payload,
}) async {
final androidNotificationDetails = AndroidNotificationDetails(
channel.id,
channel.name,
channelDescription: channel.description,
groupKey: channel.groupId,
importance: Importance.max,
priority: Priority.max,
icon: '#mipmap/launcher_icon',
);
final iosNotificationDetails = DarwinNotificationDetails(
presentAlert: true,
presentBadge: true,
presentSound: true,
threadIdentifier: channel.groupId, // Notifications with the same threadIdentifier grouped automatically
);
final notificationDetails = NotificationDetails(
android: androidNotificationDetails,
iOS: iosNotificationDetails,
);
_flutterLocalNotificationsPlugin.show(
id,
title,
body,
notificationDetails,
payload: jsonEncode(payload),
);
if (channel.groupId == null) {
return;
}
//* Grouping Messages
List<ActiveNotification> activeNotifications = await _flutterLocalNotificationsPlugin
.resolvePlatformSpecificImplementation<AndroidFlutterLocalNotificationsPlugin>()!
.getActiveNotifications();
if (!activeNotifications.any((element) => element.groupKey == channel.groupId)) {
return;
}
if (activeNotifications.isNotEmpty) {
// For Android Versions >= 7.0
List<String> lines = activeNotifications.map((e) => e.body.toString()).toList();
InboxStyleInformation inboxStyleInformation = InboxStyleInformation(
lines,
contentTitle: '${lines.length - 1} messages',
summaryText: "${payload["name"].trim()} (${lines.length - 1} messages)",
);
AndroidNotificationDetails androupGroupDetails = AndroidNotificationDetails(
channel.id,
channel.name,
channelDescription: channel.description,
groupKey: channel.groupId,
styleInformation: inboxStyleInformation,
setAsGroupSummary: true,
);
NotificationDetails groupDetails = NotificationDetails(android: androupGroupDetails);
await _flutterLocalNotificationsPlugin.show(0, "", "", groupDetails, payload: jsonEncode(payload));
}
}
}
I've tried to group the same conversation messages in one notification but later on, the group disappeared on receiving a new notification from another user.