Why does menu bar show Siri using microphone?

Since updating to macOS 12.5 I always see an orange dot in the menu bar indicating that Siri is using the microphone. It never goes away, even after I disabled Siri in System Preferences. Is this a bug, or is there some way to tell if the microphone is *really* active? I'm concerned about privacy and also battery life. This is a 2019 MacBook Pro.