Preview of PDFs created by iOS Quartz PDFContext take ages to render or fail to render at all.

We integrated the Adobe PDF Embed API PDF Viewer into our web application and during testing found out that the viewer takes very long to render PDFs created by iOS Quartz PDFContext. If it takes longer than a minute we get an error message "File preview error. File preview not available, please reload to try again.". The problem can be reproduced in the demo viewer at https://documentcloud.adobe.com/view-sdk-demo/index.html#/customize/LIGHT_BOX, so it is not a problem of our integration. In Adobe Acrobat Reader the files are displayed within an instant.

Attached is one example file which takes around one minute in the demo viewer, so sometimes it is rendered and sometimes not. What is wrong with the file? Or did we find a bug in the viewer?