Yes - this issue would only occur if you are using GSS. To clarify, I replaced the original soft "ding" with "Baggage Handling Complete" audio. At one time, the audio was seldom triggered at the start of the unloading process (for some reason) ... but would always play at the end. Thus the replacement sound worked quite well! Now the sound is always played at the beginning and end of the process and thus, it will give you one unwanted announcement at the start of the unloading process plus the correct one at the end.
I've described the issue in the Read Me file of GSS. For this very reason, there is an option to turn off this audio so you can either have it enabled but with the spurious announcement OR turn off the announcement. If Umberto was to split the triggers at some point in the future, there could be separate announcements. There is great scope for extending the audio trigger points from within GSX - future enhancement maybe?!
Nick