Facebook OpenGraphActionDialog ignores the "is user generated image" flag

Question

I'm currently trying to create a FacebookDialog that posts with a local image. I am able to create the dialog with the image and post it, but the "user generated" flag appears to be ignored.

What I'm getting is this:

...when it should look like this:

The NativeAppCallContentProvider has been set in the manifest and the "User Generated Photos" option has been enabled in the Open Graph Action

Here is the code I'm using...

OpenGraphObject ogObject = OpenGraphObject.Factory.createForPost("app:objectName");
ogObject.setTitle("title");
ogObject.setDescription("description");

// Prepare the action
OpenGraphAction ogAction = OpenGraphAction.Factory.createForPost("app:actionName");
ogAction.setProperty("objectName", ogObject);

// Prepare the image
Bitmap imageBitmap = ...
List<Bitmap> photoBitmaps = new ArrayList<>();
photoBitmaps.add(imageBitmap);

FacebookDialog shareDialog = new FacebookDialog.OpenGraphActionDialogBuilder(this, ogAction, "objectName")
    .setImageAttachmentsForObject("objectName", photoBitmaps, true) // user generated is set 'true' 
    .build();
mUiHelper.trackPendingDialogCall(shareDialog.present());

edit:

I ran the Scrumptious sample app from the Facebook SDK and it's the exactly the same. The "user_generated" property is set to "true", but the picture still appears as a thumbnail.