PDF Export Panel Application - doesn´t Export Pictures

Hi together,
I encountered a Problem with the "PDF Export Panel Application" Extension (V1.1):

Pictures are not displayed in Exportfile.

Steps to reproduce:

1. Install the PDF Export Panel Application
2. Go to Administration -> Panel Wizard
3. Drag and drop the PDF Export panel to the side
4. Click "Save the new layout"
5. Go to a wiki document which has child page(s). These child page(s) have to include a picture (jpg, png).
6. Use the Export Panel

-> Result: The Exportfile does not include the picture.

If I use the Extension to Export only a single page (including a picture) everything works just fine.

Thanks advance!

EDIT:

The Extension is 100% using the buildin Functionality.
The Issue is in the xwiki Export Function, which if is used with "&includechilds=2", will exclude the pictures.