Board Thread:Support Requests - Getting Technical/@comment-31398281-20200604083733

I want to use https://www.mediawiki.org/wiki/Extension:Maps

When I edit https://hornblower.fandom.com/wiki/Maps with Source Editor, if I try to preview the map in desktop form I get "Your browser is not compatible with Google Maps v3." This happens in firefox and chromium-browser. The page itself displays the map fine in both browers. If I ask to preview in Desktop XL it stalls, in mobile mode I get "Sorry, this article seems to be empty!"

With visual editor it stalls with "Loading map..."

Why do the editors fail to do what the main pages does? 