I assumed this was a known bug since 11.3.6 (currently 11.4.2), but I've had FSDb absolutely dive into lanes that open up on both the left and the right, even with minimize set to on.
Went on a 5,000 mile road trip in May and in Wisconsin, there were these short 100 ft right lanes that would open up to allow traffic to go around someone waiting to turn left on a county road. It would dive into those about half the time (with no one there, obviously). On the left side, it would immediately merge into HOV lanes every time one opened up.
It's so sudden, that you would know the difference between that and a normal lane change. It's immediate, with zero time to cancel with the stalk. It was so jarring I can't even remember if it used the signal or not. There aren't many of those opening lane situations back home, so I haven't been able to observe that behavior in a few weeks.