Notification background not show up (react native)

I have already integrating push notification in my apps, when i send message, notification not show up. But if i send notification from FCM cloud messaging, it’s worked well…
what’s wrong that i was config?

for my environment,
@cometchat-pro/react-native-calls”: “^1.0.0”,
@cometchat-pro/react-native-chat”: “^2.1.0”,
@react-native-firebase/app”: “^8.4.1”,
@react-native-firebase/messaging”: “^7.8.4”,

when i see listener/handler when i send message, this is the notification remote message:
if i send message from commetchat:
Message handled in the background! {"data": {"alert": "Lala", "message": "{\"receiver\":\"222650\",\"data\":{\"entities\":{\"receiver\":{\"entityType\":\"user\",\"entity\":{\"lastActiveAt\":1599796317,\"uid\":\"222650\",\"role\":\"default\",\"name\":\"dr. Rieny S Halim\",\"status\":\"available\"}},\"sender\":{\"entityType\":\"user\",\"entity\":{\"lastActiveAt\":1599796317,\"uid\":\"2970415\",\"role\":\"default\",\"name\":\"Maimunah\",\"status\":\"available\"}}},\"text\":\"Lala\"},\"sender\":\"2970415\",\"conversationId\":\"222650_user_2970415\",\"receiverType\":\"user\",\"id\":\"153\",\"sentAt\":1599798724,\"category\":\"message\",\"type\":\"text\",\"updatedAt\":1599798724}", "sound": "default", "title": "Maimunah"}, "from": "/topics/230127f5dcf0af6_user_222650", "messageId": "0:1599798725232023%3818bc6ef9fd7ecd", "sentTime": 1599798724998, "ttl": 2419200}

if i using FCM messaging directly:
Message handled in the background! {"collapseKey": "com.telemed_doc", "data": {}, "from": "/topics/230127f5dcf0af6_user_222650", "messageId": "0:1599797530202249%3818bc6e3818bc6e", "notification": {"android": {}, "body": "test", "title": "test"}, "sentTime": 1599797529899, "ttl": 2419200}

if we see in above data received, i concern in commetchat message i not see notification field, is that is the issue?