http://0.0.0.0:6927/en.wikipedia.org/v1/page/preview-html/Spain is currently returning
<p><span> </span> <span style="font-size: small;"><span id="coordinates"><span>Coordinates</span>: <span class="plainlinks nourlexpansion"><span><span class="geo-default"><span class="geo-dms"><span class="latitude">40°N</span> <span class="longitude">4°W</span></span></span></span></span></span></span></p>
as the summary
and the http://0.0.0.0:6927/en.wikipedia.org/v1/page/formatted/Spain
sets the intro as
"intro":"<p><span>\n</span>\n\n\n<span style=\"font-size: small;\"><span id=\"coordinates\"><a href=\"./Geographic_coordinate_system\" title=\"Geographic coordinate system\">Coordinates</a>: <span class=\"plainlinks nourlexpansion\"><a rel=\"m ...
Developer notes
The main crux of the issue is that we don't scrub #coordinates from output. We should and we should rely on the GeoData api (see related T152441)