Layout Page issue when export to PDF

Hello,

there is a problem when I go to export to pdf a score in which I have changed the "First page number" value in Layout Page Settings.
All is ok if I leave the value positive, but if I go to change it to negative value, then the exported pdf is corrupted with only the first page exported.
I need to use negative values because I have added several blank pages and images and index.
Is there a way to solve this?

Tommaso