I just added a Scale Event which defaults to C Major and I wanted it to be G. However when I tried to change it via the Info Line it wouldn’t change to any other Note. But if I double+click on the Scale Event I can change it there. This video shows it happening. And although its not in the video, I can change the Scale to Minor, Blues, etc. just fine in the Info Line.
I experience the same exact behavior on my machine. Upgraded to Cubase 13 a couple of days ago.