The code used to display OpenStreetMap tiles in-line in Wikivoyage articles was replaced last fall. This broke a few capabilities which existed in the old mapframe code, including the ability to display a static map if a dynamic one isn't available and the ability to draw a route or itinerary as a series of co-ordinates in GPX format.
This issue was raised in October 2016 at https://en.wikivoyage.org/wiki/Wikivoyage_talk:How_to_use_dynamic_maps#mapframe_and_GPX_traces but not resolved.
Effectively, articles like https://en.wikivoyage.org/wiki/Bertha_Benz_Memorial_Route displayed an OpenStreetMap inline on the page; this map imported to a list of GPX co-ordinates https://en.wikivoyage.org/wiki/Template:GPX/Bertha_Benz_Memorial_Route which drew the path of her Benz motorcar on the map, city to city.
The "(Edit GPX)" link still appears under the map, but the actual GPX trace is not drawn at all by the new map code. Various proposals were made to replace this functionality, including https://phabricator.wikimedia.org/T55023 but nothing was done.
As this is breaking existing functionality, this is a bug, not merely an "enhancement".