Macro in footer breaks the preview of pages

Summary

When a macro is inserted into the footer of Confluence, the preview of the pages will break. As Confluence allows macros in the footer, the preview shouldn't break.

Steps to Reproduce

1. Go to the General Configuration page.
2. Go to the Sidebar, header and footer page.
3. Insert any macro with as the following example in the Footer field:

   {attachments}
   

4. Save the changes.
5. Go to any page and scroll down. You will see the macro rendering in the footer.
6. Edit the page.
7. Click on "preview".

Expected Results

Confluence will preview properly the page.

Actual Results

The preview will be messed up.

Workaround

Remove the macro if possible.