Open https://en.wikipedia.org/w/index.php?title=Kokoda_Barracks&oldid=759615725&veaction=edit .
At the bottom of the page, create an External links section.
I type "External links", then I double click to make sure I select both words (or click and drag backwards), make them a heading.
I don't notice the Coord template is getting caught, as it is actually displayed elsewhere on the page (top right) but per WP:ORDER, the template is placed in articles after any navigation templates (before all Categories, including the {{Defaultsort}} template).
Now that I know what's happening, of course I see it highlighted in blue while selecting that line: on longer articles, that wouldn't happen.
(I have noticed that some pages, i.e. Berlin, seem to have comments at the end that maybe are meant to be instructions for VEditors, as they warn about the placement of certain items? Not that this seems a scalable solution.)
Reported by Kerry here.
(While filing this I stumbled on T67648, FWIW.)