I drove FSDb v11 (11.3.4) on the highway for the first time today. On the drive home, I started off in FSDb mode with navigation, but when I was on the highway, I decided to cancel the navigation and just use Autosteer, so I would have more control over the lane changes. Surprisingly, AP continued to make speed-based lane changes even though I was no longer navigating. Is it supposed to do that? Regular AP definitely doesn't do that.
So it seems that if you don't want the car changing lanes automatically, you have to switch off FSDb and just use regular AP.