In addition, I have spotted that it is simply impossible to link to English Wikipedia. en:Gdańsk, w:Gdańsk, wikipedia:Gdańsk, , w:Gdańsk, wikipedia:Gdańsk are all red links and do not take me to English Wikipedia.
Topic on Talk:Structured Discussions
Oh wait, they do not work at Talk:Sandbox but they work here (although they are marked as external links). Completely weird.