react-native-push-notification: onNotification not being triggered when app is killed

I am experiencing a few issues that I would like some clarity on…

When sending a notification { ... } payload from the server, notifications come through but need some customization in order to come through properly.

Example payload sent from AWS SNS:

"notification": {
  "title": "Some title",
  "body": "Some message",
  "android_channel_id": "rn-push-notification-channel-id-4-default-300" <-- This one was odd but was the only way I could find to assign it to the appropriate channel
  "color": "#somehex" <-- Had to force this or the icon color in "Brief Notifications" would display as white
},
"data": {
  "route": "some route",
  "routeId": "route id"
}

Here is what I referenced to come up with that structure ⬆️ : https://firebase.google.com/docs/cloud-messaging/http-server-ref

With the above payload I am able to receive notifications in all app states (foreground/background/killed) but it was not triggering the onNotification which means I am unable to manually do anything when a notification is pressed.

Also, for some reason, the notification banner does not contain the app logo which is present when I presentLocalNotification.

When the payload is changed to a data-only payload, I get access to the onNotification function, however this causes a few problems.

Example payload sent from AWS SNS:

"data": {
  "title": "Some title",
  "message": "Some message"
  "route": "some route",
  "routeId": "route id"
}

1. In my Android logs I get Cannot send to notification centre because there is no 'message' field in: Bundle[{userInteraction=false, id=707734631, data=Bundle[{message=Sample message for Android endpoints}], foreground=false}].
2. Once the app is killed, notifications do not come through at all.

Here is some extra info:

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="...">

  <uses-permission android:name="android.permission.INTERNET" />

  <!-- start rn push notification -->
  <uses-permission android:name="android.permission.VIBRATE" />
  <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
  <!-- end rn push notification -->

  <!-- file write permissions to save images -->
  <uses-permission android:name="READ_EXTERNAL_STORAGE" />
  <uses-permission android:name="WRITE_EXTERNAL_STORAGE" />

  <application android:name=".MainApplication" android:label="@string/app_name" android:icon="@mipmap/..." android:roundIcon="@mipmap/..." android:allowBackup="false" android:theme="@style/AppTheme">
    <activity android:name=".SplashActivity" android:theme="@style/SplashTheme" android:configChanges="keyboard|keyboardHidden|orientation|screenSize|uiMode" android:screenOrientation="portrait">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
      <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="..." />
      </intent-filter>
    </activity>

    <activity android:name=".MainActivity" android:label="@string/app_name" android:configChanges="keyboard|keyboardHidden|orientation|screenSize|uiMode" android:launchMode="singleTask" android:windowSoftInputMode="adjustResize" android:exported="true" android:screenOrientation="portrait" />

    <!-- start rn push notification -->
    <receiver android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationActions" />
    <receiver android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationPublisher" />
    <receiver android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationBootEventReceiver">
      <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
      </intent-filter>
    </receiver>

    <service android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationListenerService" android:exported="false">
      <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT" />
      </intent-filter>
    </service>


    <meta-data android:name="com.google.firebase.messaging.default_notification_icon" android:resource="@mipmap/ic_notification" />

    <meta-data android:name="com.dieam.reactnativepushnotification.notification_foreground" android:value="false" />
    <meta-data android:name="com.dieam.reactnativepushnotification.notification_channel_name" android:value="..." />
    <meta-data android:name="com.dieam.reactnativepushnotification.notification_channel_description" android:value="..." />
    <!-- end rn push notification -->
  </application>
</manifest>

notifications.ts

import ApolloClient from 'apollo-client';
import {NormalizedCacheObject} from 'apollo-boost';
import RNPushNotification from 'react-native-push-notification';

const pushTokenCache: NotificationToken = {os: '', token: ''};

export const clearAllNotifications = () => {
  RNPushNotification.cancelAllLocalNotifications();
};

export const unregisterNotifications = () => {
  RNPushNotification.unregister();
  RNPushNotification.abandonPermissions();
};

export const notificationsEnabled = (): Promise<boolean> =>
  new Promise(resolve => {
    RNPushNotification.checkPermissions(({alert}) => resolve(Boolean(alert)));
  });

export const postPushToken = async (apolloClient: ApolloClient<NormalizedCacheObject>) => {
  ...
};

export const deletePushToken = async (apolloClient: ApolloClient<NormalizedCacheObject>) => {
  ...
};

const initializePushNotifications = (callback?: () => {}) => {
  RNPushNotification.configure({
    onRegister(token: NotificationToken) {
      pushTokenCache.os = token.os;
      pushTokenCache.token = token.token;

      callback && callback();
    },

    onNotification(notification: PushNotification) {
      if (notification.userInteraction) {
        ...
      }

      if (!notification.foreground) {
        RNPushNotification.localNotification({
          title: notification.data.title ?? 'Fallback Title',
          message: notification.data.message ?? 'Fallback message',
        });
      }
    },
    popInitialNotification: true,
    requestPermissions: true,
  });
};

export default initializePushNotifications;

App.tsx

import initializePushNotifications from 'services/notifications';
...

const App = () => {
  useEffect(() => {
    initializePushNotifications();
  }, []);

  return (...);
}