The manjaro-gnome-settings messes up the default gnome keybindings.
For example <Super>1 is bound to both switch-to-application-1 from /org/gnome/shell/keybindings and switch-to-workspace-1 from /org/gnome/desktop/wm/keybindings.
Same with <Super>a which bound to switch-to-worksapce-left from /org/gnome/desktop/wm/keybindings and toggle-overview from /org/gnome/shell/keybindings.
Which keybindings will work varies from session to session.