I saw the same behavior that Andrea did on the pattypan test server so I added it to terran-testbox and it is working there.
Setting blank (default): Link does not show
Setting true: Link appears
Setting false: Link does not show
(Note that this setting controls whether the link appears in the footer navbar as well - that is also broken on pattypan with the work for bug 1839341 applied.)
I saw the same behavior that Andrea did on the pattypan test server so I added it to terran-testbox and it is working there.
Setting blank (default): Link does not show
Setting true: Link appears
Setting false: Link does not show
(Note that this setting controls whether the link appears in the footer navbar as well - that is also broken on pattypan with the work for bug 1839341 applied.)