Thumb() only creating .job/*.json but not creating media file

[zippe]

I am having a php script, it generates an image, based on fields of my page. It uses text fields and also a files field for a background image. It works good! But, when I want it to use a cropped image
$bgImage->thumb(['width' => 1200, 'height' => 628, 'crop' => true]);
it does not work.

By clearing media folder and carefully watching I found out: It only creates .job/*.json of the image but it is not creating the media file.

When I render <img src="<?=$bgImage->thumb(['width' => 1200, 'height' => 628, 'crop' => true])->url()?>"> somewhere in my template. It is created and then also the image-generator-script can display it.

I worked around by adding file_get_contents($bgImagePath->url()); to my script. It creates the media. But I am wondering, am I doing something wrong?

[texnixe]

The thumb is created on the fly when the url() method is called, or you can force it by calling $file->thumb(['width' => 100])->save()

[zippe]

marvellous