MacBook – Magic Mouse not working in macOS Mojave

I update my Macbook Pro* today to macOS Mojave 10.14 (18A391).

I have a Magic Mouse that I've been using for years and that has so far always worked.

However, now the right click with that Magic Mouse does no longer work. I can do a right click with two fingers on my Trackpad but not using the mouse.

I checked the settings and Secondary click is enabled.

Double-tap to zoom does work fine.

_{* MacBook Pro with Touch Bar (13-inch, 2017, Four Thunderbolt 3 Ports)}