I'm on 4.18, with a HW 2.5 M3 with AP (no EAP or FSD).
It certainly seems to me like AP is handling the circumstance where a lane ends or two lanes become once much better than it ever has in the past. It used to be that if I was on AP in a merge lane which disappeared but where the markings went all the way to the end the car would drive almost to the end of the lane and then swerve in to the new lane. It was always very abrupt, and not at all the way a person would do it. If there was anyone in the lane I was changing in to they'd generally be displeased, even if there was a lot of separation.
But today, in the same circumstances, it just drifted over in to the new lane, pretty much the way a human driver would.
Similarly, I was on a surface road where two lanes turn to one, with the dividing line disappearing. In the past, my recollection is that it would usually abruptly try to recenter when the markings went away. Today, it more gradually drifted in to the center position. I'm not as sure about this one as I am about the case with the merge lane, though.
Yah. We noticed the same thing twice today.