Display Interface and Background Images not working properly

[fabeat]

Hi,

I am trying to add a background image to a Display Interface body template.

I tried the following code:

$backgroundImage = new Image();
$backgroundImage->contentDescription = "Some Background";
$imageSource = new ImageSource();
$imageSource->url = 'https://example.com/some/image.jpg';
$backgroundImage->sources = [$imageSource];
$template->backgroundImage = $backgroundImage;

This code produces the following JSON response:

"sources": [
    {
        "url": "https://example.com/some/image.jpg",
        "size": null,
        "widthPixels": null,
        "heightPixels": null
    }
]

The Amazon API seems to have a problem with the empty values (for size, widthPixels and heightPixels)

This code works fine:

$backgroundImage = new Image();
$backgroundImage->contentDescription = "Some Background";
$backgroundImage->sources = [['url' => 'https://example.com/some/image.jpg']];

The properties for for size, widthPixels and heightPixels should therefore be omited in the response.

Cheers,
Fabian