On https://en.wikivoyage.org/wiki/New_York_City you'll see the historical "Related pages" menu item in the left menu (note this is DESKTOP).
It's not showing up in http://en.wikivoyage.beta.wmflabs.org/wiki/Related_test
as it's being controlled by wgRelatedArticlesShowReadMore which is defaulting to false
The historical menu item should be determined by a separate configuration variable and not be controlled by wgRelatedArticlesShowReadMore
 If read more (footer) is enabled and related articles (left menu) is enabled but I do not have the beta feature enabled then I see the links in the left menu.
 It should be possible to enable read more but disable the left menu behaviour (e.g. for English Wikipedia)
 If read more footer and left menu are both enabled on Vector I see both (for time being until features have been consolidated)
Introduced by T117444