Issue Summary

When exporting a Confluence page to PDF via a Browser Private/Anonymous window, the first attempt results in an error:

Your session has expired. You may need to re-submit the form or reload the page.

After receiving the error, if going back to the page and trying to export it again, it works.

Error looks similar to previous bug CONFCLOUD-77713, but it's limited to Anonymous browser windows this time.

Steps to Reproduce

1. Open a private/anonymous window in your browser
2. Login to Confluence and create a page (any title and body)
3. Publish the page and export it to PDF right away

Expected Results

The page should get exported and available to download.

Actual Results

Results in the following error:

Your session has expired. You may need to re-submit the form or reload the page.

Workaround

Access the page again and perform a new export attempt. Or access it via a regular browser session, if feasible.