lazy load image 1pixel not loading properly in pdf

Just reporting this issue with rendering images in pdf the 1pixel temporary for lazy loading is returning “red cross” which I assume is not finding the image.

Also is there a way to skip lazy load if its pdf creation? I am using DKPDF plugin also I have access to the image creation/output via “the_content” filter.
ex.

 $output .= wp_get_attachment_image(
                                $attachment_id, $size, false, array(
                                'alt' => $alt,
                                'title' => $alt
                                )
                        );

If you can point me in the right direction that would be great.

Thanks

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