NO notification_open if MainActivity is singleTask

Author: kevinezhang

app/src/main/AndroidManifest.xml

@@ -28,7 +28,8 @@
         <!-- [END fcm_default_channel] -->
 
         <activity android:name=".java.MainActivity"
-            android:exported="true">
+            android:exported="true"
+            android:launchMode="singleTask">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />