There's a volume mixer extension for Decky that might let you fix muted applications from desktop mode.
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I believe there is a setting to disable showing the volume on applications open in the taskbar in the settings app (naturally, in desktop mode).
Or it might be an option after right clicking the taskbar. Can't recall which one it is.
Disabling this should prevent you from being able to mute them accidentally in the future.
Heh, stumped my kids on my desktop as well for a while.