bug: some xfce4 plugins not working when installed by home-manager

Are you following the right branch?

[X] My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

[X] I have searched the existing issues

Issue description

In NixOS XFCE environment, I wrote a .nix file containing several XFCE plugins.

       home.packages = with pkgs; [
        xfce.xfce4-appfinder # Appfinder for the Xfce4 Desktop Environment
        xfce.xfce4-cpugraph-plugin # CPU graph show for Xfce panel
        xfce.xfce4-panel # Panel for the Xfce desktop environment
        xfce.xfce4-power-manager # A power manager for the Xfce Desktop Environment
        xfce.xfce4-pulseaudio-plugin # Adjust the audio volume of the PulseAudio sound system
        xfce.xfce4-screenshooter # Screenshot utility for the Xfce desktop
        xfce.xfce4-session # Session manager for Xfce
        xfce.xfce4-settings # Settings manager for Xfce
        xfce.xfce4-taskmanager # Easy to use task manager for Xfce
        xfce.xfce4-whiskermenu-plugin # Alternate application launcher for Xfce
      ]);

and I install it by home-manager. After the installation, some of them seem to not work. For example, I note that inside the XFCE panel properties, Whisker menu does not appear.

The non-working XFCE plugins are:

xfce.xfce4-cpugraph-plugin
xfce.xfce4-pulseaudio-plugin
xfce.xfce4-whiskermenu-plugin

These plugins works only if I install them at system level by

       environment.systemPackages = with pkgs; [
        xfce.xfce4-appfinder # Appfinder for the Xfce4 Desktop Environment
        xfce.xfce4-cpugraph-plugin # CPU graph show for Xfce panel
        xfce.xfce4-panel # Panel for the Xfce desktop environment
        xfce.xfce4-power-manager # A power manager for the Xfce Desktop Environment
        xfce.xfce4-pulseaudio-plugin # Adjust the audio volume of the PulseAudio sound system
        xfce.xfce4-screenshooter # Screenshot utility for the Xfce desktop
        xfce.xfce4-session # Session manager for Xfce
        xfce.xfce4-settings # Settings manager for Xfce
        xfce.xfce4-taskmanager # Easy to use task manager for Xfce
        xfce.xfce4-whiskermenu-plugin # Alternate application launcher for Xfce
      ]);

Maintainer CC

No response

System information

- system: `"x86_64-linux"`
 - host os: `Linux 6.1.65, NixOS, 23.11 (Tapir), 23.11.1494.b4372c4924d9`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.1`
 - channels(root): `"home-manager-23.11.tar.gz, nixos-23.11"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

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nix-community / home-manager