Baobab icon not appearing in Xfce window buttons
The window icon is set to baobab
rather than org.gnome.baobab
which causes a blank icon to appear in Xfce's window buttons panel plugin in icon themes that don't have both icons present, like Adwaita.
https://gitlab.gnome.org/GNOME/baobab/-/blob/master/data/ui/baobab-main-window.ui#L67
Reported in Xfce: https://gitlab.xfce.org/xfce/xfce4-panel/-/issues/434