Much other keyboard accessibility is also painfully broken. It’s basically only usable by mouse. Up/Down do the wrong thing almost every time (though within a multi-line paragraph, sometimes they do the right thing, but it’s not consistent).

Getting keyboard navigation reasonably right everywhere will be very difficult. Ironing out the remaining platform differences may be even more difficult.

I also broke it (a nondescript TypeError once, “invariant broken” another time) fairly quickly, by tabbing to the cog thing, Space, tab to the Duplicate button, Space—where clicking didn’t achieve that.