[RC16] Keyboard shortcut for Layouts Manager doesn't work

The shortcut given for opening the Layouts Manager is Ctrl+). I can’t get it to work. If I edit the shortcut and change it to Ctrl+( it works fine.

Further editing to go back to Ctrl+) does not work. I can’t get any indication that my keyboard has a defective ‘)’ key so I wonder whether this shortcut has been ‘blocked’ by Scrivener software ?

Especially in light of thread : https://forum.literatureandlatte.com/t/suggestion-built-in-layouts-should-be-shown-on-layout-menu-of-view-button-by-default/49239/1 where the Built-In Layouts are temporarily kept out of sight.