Getting silent notification values when app starts - ios

Question

I am trying to implement cache meachanism for FCM on IOS. I am using Xamarin Forms with CrossGeeks FirebasePushNotificationPlugin
Push notification service works fine. I am using payload pattern as below
{
"data": {
"message" : "my_custom_value",
"other_key" : true,
"body":"test"
},
"notification": {
"body" : "hello",
"title": "firebase",
"sound": "default",
"content_available" : true
},
"priority": "high",
"condition": "'general' in topics"
}
Above pattern appears delivered notification as alert on IOS main screen.
I have written a Dependency Service for getting undeleted or unopened accumulated notifications when app starts. Dependency Service include below codes
await UNUserNotificationCenter.Current.GetDeliveredNotificationsAsync();
When I use above payload, I can get accumulated notifications. But when I use payload pattern as below, I can not.
{
"data": {
"message" : "my_custom_value",
"other_key" : true,
"body":"test"
},
"notification": {
"content_available" : true
},
"priority": "high",
"condition": "'general' in topics"
}
Actually I would like to send 2 payload types for every notification for my cache mechanism because of prevent the user's delete action. After that, I would like to show cached notifications without any lost in my app's notification page.
Shortly my question about "I am not getting silent payload values from UNUserNotificationCenter this approach is possible or not?"
Or can I prevent the user's notification delete action from IOS main screen when my app is terminated.
Note: My minimum OS version is 10.0 in info.plist
Thank you in advance.