Qt3D document files show 'Page not found' on Creator Help

Install Qt5.11 beta 4 content, and open Creator. Open Help view and click on following help items:

Qt 3D Render

Qt 3D Animation

Qt 3D Core

Qt 3D Scene2D

Qt 3D Input

Qt 3D Extras

Qt 3D Logic

Page on the right that should show the help content, has 'Page not found..' text.

There  is no 'Page not found's with Qt5.10.1, but the docs are listed under the main Qt3D node, in Qt5.11.0 above mentioned docs are listed separately on the main level.