Cannot switch pages in overview category folders with keyboard

In GNOME Shell 42.beta, if a "category folder" in the overview (e.g. Utilities) has two pages, it does not seem possible to move between them with the keyboard.

In 42.alpha and 41, you could press 'down' twice after opening a category folder and then press 'right' and 'left' to switch between pages. But in 42.beta this does not seem to work.