I might be mistaken but I believe in your case the camera is simply missing the double white divider and therefore might just believe you are in a 4 lane traffic, in that case it simply prevents you from overtaking from the right? (as you are in LHD US)I’m in the states but I’ve been experiencing something perhaps similar for a while now, attached to FSDb 11.4.x firmwares. This presents itself while using the legacy features with FSDb turned off. (You guys aren’t missing anything btw).
Does the screen highlight cars in adjacent lanes when you experience this phenomenon? See the attached photo.
I have a pet theory that some of the FSDb code has “infected” regular autopilot. It’s awful.
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I have described this behaviour last week too, but I can't remember if prior to a these couple releases, it used to highlight only the car used as reference for TACC speed, of if now hilighting both the car on your left & the car far away in your own lane at the same time is indeed a new thing. (and WIP to say the least).