When adding a new section to a page (e.g., https://en.wikipedia.org/wiki/User:Whatamidoing_(WMF)/sandbox?veaction=editsource§ion=new ), it's not possible to add a link within the original section heading or to use any other features from the toolbar. This means that most editors will be unable to add a section heading such as this one:
== [[m:Special:MyLanguage/Tech/News/2016/51|Wiadomości Techniczne: 2016-51]] ==