Image style config does not have dimensions data after changing the effects

I have an image style using Focal Point Scale and Crop and Watermark effects. I use the following code

$style_storage = \Drupal::entityTypeManager()->getStorage('image_style');
$styles = $style_storage->loadMultiple($style_list);
if ($style_config = $style->getEffects()->getConfiguration()) {
  $style_data = array_values($style_config)[0]['data'];
}
if (empty($style_data['width'])) {
....
}

It works ok, but when I add another focal point scale, move it to the top and delete the previous focal point scale, the $style_data['width'] is empty. Removing the watermark effect and adding it again solves it, the $style_data['width'] is populated again.

Not sure, but it seems like it is a bug.