@LukeScrewdriver Hi, thanks for your report.

Is there any shell extension or modification by Ubuntu installed that displays application volume levels in the quick setting panel?
AFAIK, the stock quick setting panel doesn't have the application volume levels:

Observations:

• In Settings > Sound > Volume Levels, only one GJS playback stream is shown, even after changing the wallpaper.
  
• Enabling application volume levels in the quick setting panel with the Quick Settings Tweaker extension yields the same result.
  

Based on these observations, it seems unlikely that this issue is caused by the Hanabi extension. It may be related to the shell extension or modification by Ubuntu responsible for displaying application volume levels in the quick setting panel.

Thank you for the quick response.

Yes I have several extensions installed and among them I found the one you pointed me to Quick Settings Tweaker.

I have now disabled it.

I went to Settings > Sound > Volume Levels as you suggested to find this one instead.

Honestly I also have themes active but I doubt these are the cause.
I'm going to try rebooting everything now and see if anything changes

Ok i rebooted and nothing changed.
That I did something wrong?
I'll try to see the installed version of hanabi and confront it with the latest one

Thanks for the screenshot. At first, I thought this might be a bug in the Quick Settings Tweaker that you are using. However, from your screenshot of Volume Levels, this could be an issue in the Hanabi extension. (I suppose the Settings always show the accurate info)

Unfortunately, I couldn't reproduce this issue on my system, and the investigation will become harder. I'll see if I can reproduce this issue on Ubuntu VM.