When using external process pool for space PDF export, header and footer customizations can't be added to table of contents

Problem Definition

External process pool does not take in space PDF header and footer customizations for table of contents page. Customizations can be picked up when not using external process pool.

      <div style="margin-top: 10.0mm;">
       <h1>Custom Header</h1>
      </div>

      <div style="margin-bottom: 10.0mm;">
      <h1>Custom Footer</h1>
      </div>   

div.toc{
   page:toc;
}  

Workaround

Disable external process pool with system property pdf.export.sandbox.disable, per PDF export in Confluence Data Center.