From Dunst 1.7 on it does not handle keyboard-shortcuts by itself anymore. To use shortcuts in i3, it is necessary to call dunstctl.
Manjaro’s i3 config should be adjusted.
check any pacnew with pacdiff
What do you want to tell me? I already executed pacdiff and there where changes to global dunst config - yes - but i3-config still needs new shortcut definitions.