Within any page a link such as [[#Section Heading]] will hyperlink to that === Section Heading === within the same page.
That works fine when the page is displayed and navigated by any user normally.
When editing a page section containing such a link it is possible to use the Preview button to test the link.
BUT then such links always jump to the Knowledge Base Home page instead.
Furthermore, links within the current page should usually be shown in italics.
The workaround requires the current page name to be added before the section heading in the link:
e.g. [[Page Name#Section Heading]]
To do that throughout the KB is going to be tedious, and it makes reorganising pages with such links more error prone.