Orage tray icon updating depends on obsolete signal
After resuming sleep, Orage dynamic icon can be updated by using on UPower signal org.freedesktop.UPower.Resuming. This seingal is not available on FreeBSD and probably on most Linux distributions. It was removed from UPower in 2013.
Possible replacement on Linux is to use systemd provided alternatives.
Related issues from old Bugzilla: