The documentation suggests
You can append a link tip, which appears as a tooltip. Example: [pagetitle#anchor|link tip]
However, when I try this, it simply does not work. The URL appears as a non-existing target. I have also tried several variations using the Insert URL GUI, without success. I am however able to insert those as <a> tags with href and title to make a tooltip to work in the source editor, but that defeats the benefits of relative links to internal page references.
Anyway to get this inserted correctly?