Quick question after something I noticed...

I noticed that only the rear view mirror and the driver side mirror dim to prevent glare, but I didn't see the passenger side mirror have that capability. Is this normal? I want to believe so because I don't see that "line" around the edge of the passenger side mirror, but I find it strange that the passenger side mirror doesn't auto dim like the other two. I recently dropped off the car for service and was given a Jaguar XF as a loaner and all three mirrors automatically dimmed.

Can anybody confirm what I am seeing to be "normal" - and does anybody know why that may be the case to NOT dim the passenger mirror, if it is normal?

Thanks in advance.