For example, [[s:w:darth:Main Page|Darthipedia's main page]] from Help:Links.
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@Saftzie Have you got further examples? As far as I can see, every link on that page points to where it's supposed, with the exception of that one, which goes to the wiki but the page doesn't exist, presumably because it's a Finnish wiki where Main Page is not "Main Page"?
Edit: I see @--miki-- changed it and that darth is Greedopedia these days. I'm sure I'm probably the cause of that, but, I don't remember what rename magic happened for that to be a thing.
So miki changed the Darthpedia link to Brickipedia, but it's still broken.
[[s:w:lego:Main Page|Brickipedia's main page]] yields http://www.shoutwiki.com/wiki/w:lego:Main_Page instead of https://en.brickimedia.org/wiki/Main_Page (and redirects out of shoutwiki.com, anyway).
Previously [[s:w:darth:Main Page|Darthipedia's main page]] yielded http://www.shoutwiki.com/wiki/w:darth:Main_Page instead of https://darth.shoutwiki.com/wiki/Etusivu.
"every link on that page" isn't necessarily a problem. I'm only pointing out the crosswiki (s:w:) ones.
So, long story short, I was reminded that functionality is provided by a custom(ised?) extension we've got. It was broken when we upgraded, so it got "temporarily" disabled. I pulled in the fixed version but forgot to reenable the extension. That's now sorted.