How to fix Xiaomi specific RemoteServiceException with notification icon?

We have a lot of crashes specific to Xiaomi phones on Android 6 and 7:

Fatal Exception: android.app.RemoteServiceException: Bad notification posted from package x.y.z: Couldn't create icon: StatusBarIcon(icon=Icon(typ=RESOURCE pkg=x.y.z id=0x7f0200ad) visible user=0 )
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1715)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:163)
   at android.app.ActivityThread.main(ActivityThread.java:6358)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:880)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770)

I've found a lot of similar crash reports and articles on the net. Here is a few:

How to fix: android.app.RemoteServiceException: Bad notification posted from package *: Couldn't create icon: StatusBarIcon

https://medium.com/@Miqubel/the-story-of-a-hard-to-fix-bug-ac6ed819cb49

But the difference is that we have these problems only on Xiaomi phones (Android 6 and 7) and probably not during updates as the same users have the crash several times in the same release version.

Interestingly I couldn't find anything on the net on this specific case and we don't have any Xiaomi phones around.

I set the notification something like this:

NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        int importance = NotificationManager.IMPORTANCE_HIGH;
        NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, importance);
        notificationChannel.enableLights(true);
        notificationManager.createNotificationChannel(notificationChannel);
    }
    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID)
            .setSmallIcon(R.drawable.ic_notification)
            .setPriority(NotificationCompat.PRIORITY_MAX)
            .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
            .setContentText(body == null ? "" : body)
            .setAutoCancel(true)
            .setContentIntent(PendingIntent.getActivity(
                    context,
                    0,
                    pendingIntent,
                    PendingIntent.FLAG_UPDATE_CURRENT
            ));

We also have Facebook notifications, which have to be set in a similar manner, but on a different Notification class. I don't know if it's relevant. Did anybody ran into this or have any recommendation how to fix this apart from wrapping the setSmallIcon and/or the setLargeIcon methods in a Manufacturer and Android version check?

EDIT: I couldn't find a solution, but here are a few new thoughts:

• We released a new version, but excluding Xiaomi users from notification didn't help! Now I think the problem is caused by the custom code in ActivityThread.java. MIUI probably fires a notification from here on some event. There are a few dozen events in stock Android here, but none of them fires a notification. But something is wrong with our icons, so they crash.

• But what is wrong with our icons? We have an ic_notification, which is probably not used for this. On the other hand, ic_launcher is a mipmap. Is it maybe this? But I couldn't find any problems regarding Xiaomi and mipmaps.

• The crash report always mentions the same resource id across several app versions: 0x7f0200ad. Is this special for some reason? How can I reverse engineer our app to get the resource name for this?

EDIT2:

• I reverse engineered the app with apktool, but the resource id is not in public.xml, which seems to be the equivalent of R.java. Our ic_notification and ic_launcher is in the list with a different id. So is this a system resource what MIUI cannot find?

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