Terrible and Scary Drive with V12.3 today.
Today I drove this route, as I do a few times per week.
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It's most two-lane roads with a 55 MPH speed limit. Things that happened:
1. On a curve, the car went well over the double yellow line when a car was coming in the other direction. I saved the dashcam footage, and I'll post that tomorrow.
2. The car often drove on the double yellow line, such that I'd hear the tires bumping on the plastic lane markers or vibrating from the groves in the lines. This happened even on straightaways. It consistently hugged the center line.
3. Although the speed stuttering is perhaps less that it was, the car consistently drives too slowly. I set the max speed to 58 MPH, and the car will drive 50 or 51 MPH even on straightaways, no other cars around, sunny, dry pavement.
4. Four times, the car went way too fast around a curve. Here's what I think happened. As mentioned, the car drives too slowly, so on a straightaway, I'll press the accelerator to bring the speed up to 58 MPH and
release my foot. The car keeps driving at 58 MPH, even when it comes to a curve. Some of these were dramatic and scary. I can't say whether staying at the new speed is a new thing, because it hasn't driven too slowly in the past. OTOH, I did not notice this behavior on V12.2.1. I've done this same drive two or three times with 12.2.1.
I reported all these events.
V11.4.9 and earlier versions were much better on this drive.