Shortcut for reverse contrours not working

Am I the only one for whom it does not work?

Weird quirk: when i open any of the app menu’s from the app toolbar and hit the shortcut, it works. As soon as I go to the next master, and/or select another shape, it stops working, until I open a menu again, and in that case it does keep working as long as I don’t touch the app.

3435

tested on another computer where it also does not work, not even with the menu open.