Stay on Page only works once in Edit

To prevent you accidentally navigating away from an Edit, Confluence has a dirty page check that asks if you want to stay on the page or navigate away. It asks this whether you hit Back or click on a breadcrumb etc. to navigate.

However, if you:

• Hit back (or click a link)
• Choose Stay on page
• Hit back again (or click a link)
  Then you don't get a second dialog.

This occurs on both "Quick Edit" and Full Edit. It does not occur on comments.

I've tested in Chrome and various IEs