Ouvrir une application en arrière-plan depuis le terminal

J'essaie d'ouvrir une application en arrière-plan à partir du Terminal en utilisant la fonction -g ou --background comme suit

open -g -a Franz

Malheureusement, l'application ne s'ouvre pas en arrière-plan. J'ai également essayé le j qui est censé cacher l'application, selon l'aide :

Usage: open [-e] [-t] [-f] [-W] [-R] [-n] [-g] [-h] [-b <bundle identifier>] [-a <application>] [filenames] [--args arguments]
Help: Open opens files from a shell.
      By default, opens each file using the default application for that file.  
      If the file is in the form of a URL, the file will be opened as a URL.
Options: 
      -a                Opens with the specified application.
      -b                Opens with the specified application bundle identifier.
      -e                Opens with TextEdit.
      -t                Opens with default text editor.
      -f                Reads input from standard input and opens with TextEdit.
      -F  --fresh       Launches the app fresh, that is, without restoring windows. Saved persistent state is lost, excluding Untitled documents.
      -R, --reveal      Selects in the Finder instead of opening.
      -W, --wait-apps   Blocks until the used applications are closed (even if they were already running).
          --args        All remaining arguments are passed in argv to the application's main() function instead of opened.
      -n, --new         Open a new instance of the application even if one is already running.
      -j, --hide        Launches the app hidden.
      -g, --background  Does not bring the application to the foreground.
      -h, --header      Searches header file locations for headers matching the given filenames, and opens them.

L'application s'ouvre au premier plan comme si j'avais simplement appelé

open -a Franz

Une idée de la raison pour laquelle cela ne fonctionne pas et une alternative ?