I am running Joplin 2.10.13 (prod, darwin) on MacOS 13.3.1 (22E261) and trying to change a Keyboard Shortcut configuration, specifically the option-cmd-D used by the Journal plugin.
When I click-to-edit, and press another key combination (that I already confirmed is not used anywhere) I get a triangle with a ! in the far right.
I also tested on many keyboard shortcuts that would also not allow me to make a change but looked like I could. Some appear locked because I get the triangle-! immediately on click-to-edit.