Fcm Notification cannot appear when app is close/kill state

I am Using FCM in ionic 4 application.
I am using the below code to use generate push notification.

{
“to”:“hsagh_t2bvH0:APA91bHEkCghsw4tZa86mihDiHvdH71T0LbDtPwM-VP05nHW3di1_2XXbM7gNk08rYyokNcnexHLa3VExirA-Y6_fHB2pfPITws7j3oXethgfh78iG1U1WwB8rQ”,
“notification” : {
“body” : “New announcement assigned”,
“OrganizationId”:“2”,
“content_available” : true,
“priority” : “high”,
“subtitle”:“Elementary School”,
“Title”:“hello”
},
“data”: {
“title”: “TITLE”,
“body”: “MSG”,
“forceStart”: “1”

  }

}

push notification comes only app is background, the other two states kill and foreground the push notification cannot appear please help me to solve this.

bump, same issue:

Ionic 4 app code:

this.fcm.onNotification().subscribe(data => {
        console.log(data);
        if (data.wasTapped) {
          setTimeout(() => {
            console.log('Received in background');
            this.router.navigate(['incoming-order']);
          }, 500);
        } else {
          console.log('Received in foreground');
          this.router.navigate(['incoming-order']);
        }
      });

    });

And the JSON format for sending the notification:

{
 "to" : "--device_key_here--",
 "collapse_key" : "type_a",
 "priority":"high",
 "notification" : {
     "body" : "Delivery for 2 parcels nearby",
     "title": "New Delivery Request",
     "click_action": "FCM_PLUGIN_ACTIVITY"
 },
 "data" : {
     "body" : "Delivery for 2 parcels nearby",
     "title": "New Delivery Request",
     "forceStart": "1"
 }
}

Please if anyone has come across similar issues? doesn’t seem to be device specific testing on 2 different devices.