I can repro that.
So basically, go via Ember route internally and it works fine, but going directly causes this error.
FYI the logged error is:
ActionView::Template::Error (No route matches {:action=>"map_feed", :category_slug_path_with_id=>"staff/4", :controller=>"list"})
app/views/list/list.erb:134
This might be a problem with the Locations plugin which is not sufficiently overriding the application which appears to be trying to render the route as an erb … but I could be wrong.
The question is, should the application assume this is an erb template?