xfce4-panel systray plugin doesn't update automatically without a restart
OS: xubuntu 22.04 version: xfce4-panel 4.16.4
The plugin does not show the newly started applications (e.g. Slack, Telegram), but after restarting the process
/usr/lib/x86_64-linux-gnu/xfce4/panel/wrapper-2.0 /usr/lib/x86_64-linux-gnu/xfce4/panel/plugins/libsystray.so
The icons show again.