We upgraded the Mobile HC version from 220.127.116.11 to 18.104.22.168 and we are observing additional push notification message "Waiting for an external action to finish." whenever the camera functionality is launched. The message was not observed in the HC version 22.214.171.124.
I could see the reason why it was introduced from the below link. However is there a way to suppress this notification.
On the other hand with no notification on a status bar mobile app process may get stopped by OS in order to release memory for Camera app. If that happened all the context e.g. data entered to a form before Camera was launched would get lost. In order to avoid that mobile app has to display the notification badge on a status bar (actually it's not push notification). Due to Android nature showing notification can't be avoided without risking data loss.