Steps to reproduce the issue

Try to add an image to a menuItem or to the offline page.

Expected result

The image is selected and the image name is stored in the parameter images.

Actual result

The image is not stored as filename but with additional text.
Example:
public $offline_image = 'images/headers/maple.jpg?joomla_image_width=700&joomla_image_height=180';

and no image is shown in the frontend

System information (as much as possible)

Additional comments