When writing automation, the project window shows mute lane?

In the automation panel I have “Reveal Automation on Write” enabled.
This works fine but it also opens the mute automation lane for the track in question.
Even if I’m writing volume automation.
Why is this so? Makes the project confusing to look at.

So why is the mute lane opening at all?
Is there a way to stop it from opening?
Unless I’m writing mute automation of course.

Is this a bug?
Doesn’t seem correct in any case.