Comment 6 for bug 1555831

I managed to recreate, in fact it happens everytime.

I think it is an indicator-sound issue, as I can see the following difference in the indicator before and after the call:

BEFORE:
dict entry(
                        string "icon"
                        variant struct {
                              string "themed"
                              variant array [
                                    string "audio-volume-high-panel"
                                    string "audio-volume-high"
                                    string "audio-volume"
                                    string "audio"
                                 ]
                           }
                     )

AFTER:
dict entry(
                        string "icon"
                        variant struct {
                              string "themed"
                              variant array [
                                    string ""
                                 ]
                           }
                     )

The themed icon looks incorrect.

Investigating it...