Please Suggest:-- I have implemented flutter push notification in android side, working fine in foreground and background and i am also able to tap notification and navigate to specific screen.But when app is terminated i am not able to get initial firebase message

FirebaseMessaging messaging = FirebaseMessaging.instance;
// Check if the app was launched from a notification
RemoteMessage? initialMessage = await messaging.getInitialMessage();

this is working when my payload is something like this
{
"message": {
"token": "device token",
"notification": {
"title": "test notification",
"body": "test body"

       },
  }
}

but not working when i used this payload

{
"message": {
"token": "device token",
"notification": {
"title": null,
"body": null
},
"data": {
"title": "test notification",
"body": "test body"

       },
  }
}(suggest according to this payload:--i have make title ans body null inside notification object so that when app is terminate atleast notification trigger )

I have handled custom notification.(Only i stuck when app is terminated and tap on notification , on tap i need to navigate to specific screen)

{
"message": {
"token": "device token",
"notification": {
"title": "test notification",
"body": "test body"

       },
  }
}this payload can work without handling notification launcher , i need to handle notification so thats why i am using data instead of notification payload