Context Help (F1) does not work most of the time

Pressing F1 when the cursor is on a Qml element does only show 'The page could not be found'. However, 1 out of 5 times it works!

How to reproduce

Open standard qml file (Helloworld), go to the root Rectangle element and press F1

(I quickly debugged this: It seems the list of base classes returned by HoverHandler::prettyPrint is empty).