On https://en.wikivoyage.org/wiki/New_York_City you'll see the historical "Related pages" menu item in the left menu.
It's not showing up in http://en.wikivoyage.beta.wmflabs.org/wiki/Related_test
as it's defaulting to false
The historical menu item should be determined by a separate configuration variable and not be controlled by wgRelatedArticlesShowReadMore
Introduced by T117444