1. Letting autopilot go in a left turn lane at an intersection(don’t judge, I like testing it out to see what it’ll do), the behavior has changed. In <= 2018.6, it would silently fail to turn completely and start heading into the ooncoming traffic in front. Now, it sees what’s going on and throws up the red hands and gives up control. I’d consider the latter to be correct behavior, until FSD is available.
I've noticed the same. In 10.4, AP2 is much more willing to throw up the red-hands-of-doom alert. Arguably in the right situations. Before, it would just make an arbitrary decision hoping you'd take over.
I also agree that the current behavior is right -- when AP is pushed beyond its limits, I'd rather it recognize that it doesn't know what to do and angrily beep at a driver in case they've zoned out.