Hardcode Tray Not Working on Linux Mint 21.1 Cinnamon

### Specifications
- Hardcode-Tray: 4.3
- OS Version: Linux Mint 21.1 Cinnamon
- Gtk version : 3.0
- Inkscape version : N/A
- Cairo version : `` if installed
- Sni-qt version: `` if installed
- Application name : ``
- Application version : ``

### Expected behavior and actual behavior

### Steps to reproduce the problem
1. Installed via instructions for Ubuntu 16.04+ on more than one working machine
2. Tried installing via manual installations, rebooted
3. Nothing is changed when looking at the tray before or after installing the application

No source file, test, application name, or expected tray behavior is identified. Start by reproducing the installation steps on Linux Mint 21.1 Cinnamon with the listed GTK version, then trace why the tray remains unchanged; done means the affected tray icons work as expected after installation.

Written by the indexing model from the issue text.