Notifications obtained from NotificationManager does not have any data. To distinguish them it is possible to send AndroidNotification.tag tr FCM see https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#androidnotification

fun Context.notificationManager() =
    getSystemService(NOTIFICATION_SERVICE) as NotificationManager

...

context.notificationManager()
    .activeNotifications
    .onEach { statusBarNotification ->
        // Api should send processedNotificationsUuids as tag
        // https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#androidnotification
        if (statusBarNotification.tag in processedNotificationsUuids) {
           context.notificationManager()
                  .cancel(statusBarNotification.tag,statusBarNotification.id)
        }
    }