When hovering over a Mute or Solo button the button’s color changes to a medium-gray. However, if a Mute or Solo button is active the hover color should change to a non-gray color. In Light & Dark themes, it instead it changes to (a slightly darker) medium-gray color whether it’s active or not. This makes it so you can’t tell if the button is active or not when you hover the mouse over it. This would occur when you’re trying to unmute many tracks (but not all) and you don’t want to click the button if it’s already active. Classic and High Contrast themes don’t have this problem.