Comment 7 for bug 1738034

Sorry for my deleted comment, since you said "it's most likely THE issue with..." I thought you were referring to some specific issue that you failed to mention. I assume you meant "most likely AN issue with".

Anyway,

The icon is EXPECTED to become red when a sound plays and the volume is muted.

The issue is that the icon doesn't go back to normal and REMAINS red when the sound is finished playing.

I find it hard to believe this is an issue with an theme, are you sure it is?