[BUG] Indicator not present on Gnome panel

[xanda-escuyer]

Describe the bug
The indicator will not display in the Gnome panel, whether run from the command line or from the Applications panel.

To Reproduce
Steps to reproduce the behaviour:

1. Run app from the Gnome menu
2. Run from command line

Expected behaviour
Indicator shortcut should appear in Gnome panel

Screenshots

Desktop (please complete the following information):

• OS: PureOS/Debian 11 64-bit
• GNOME 3.38.5/Wayland
• Sound Switcher Indicator version: 2.3.9
• Installation source: sudo snap install indicator-sound-switcher

Indicator config:
Attach the file ~/.config/indicator-sound-switcher.json - does not seem to be available

Indicator log:
In order to fetch it, quit the indicator from the menu ("Quit"), open Terminal and start it again as follows:

indicator-sound-switcher -vv

AudioSwitcherRpt.txt

Additional context

Add any other context about the problem here:-
We've tried changing the panel colour to isolate if this is a black-on-black problem, but the icon is still not present.

[yktoo]

I see the icon is visible next to the app's name, where did you expect the icon to be?

[xanda-escuyer]

The screenshot shows what happens when the app is run from the Gnome applications panel: The icon/menu & whirling donut appear momentarily only then to disappear entirely.
When invoked from the command line there is no such appearance (with or without the -vv switch).
In both cases the process remains running.
The response is also the same with all other extensions disabled.

[yktoo]

Do you see any other app icons in the system tray?

[xanda-escuyer]

Yes there are other icons in the system tray.
Partial screenshots attached - one with extensions enabled, the other without.

[glaubersm]

The icon is black on Arch Linux running gnome-shell 1:43.3-2 and indicator-sound-switcher 2.3.9-1.

[yktoo]

I tried to install Arch in Virtual Box but that turned out mission impossible. I someone made a bootable ISO that reproduces the problem, that'd make a good chance of the issue ever being resolved.

[glaubersm]

gnome-shell-extension-appindicator package was updated a few minutes ago on my system and now the icon is correct.