Attachment link using the rst trac directive: attachment:wiki:testattachments:facets_screenshot.png -- broken

Link to a wiki page using the rst trac directive: wiki:testattachments -- works

Link to a ticket using the rst trac directive: #1 or ticket:1 --works

Link to an external website: Python

Attachment link as external link: facets_screenshot.png

Attachment link in wiki syntax: attachment:facets_screenshot.png -- works