I have the same issue. I had less than 300 miles on the truck and took it back to the dealer for them for another service.
When I left there, I had made several right turns but no lefts. When I did attempt to make a left turn, I got the same thing. I immediately headed for the dealership that I had left. When I pulled into the dealer and got my salesman, he grabbed one of the service managers and it was still doing the same thing. He took in the back, unhooked the battery, and then hooked it back up. It quit. Then a few days later, it did it again. I turned it off and restarted it and it was back to normal.
About a week later, the service manager called me and said they had another 2024 doing the same thing. He said he had reached out to a GM Field Service Tech and come to find out they had another pair in Minnesota doing it as well. The GM guy said it was an issue with the headlights themselves and they were going to send a new pair that would have to come off of the production line since they had none in stock.
Now I also have several other intermittent electrical issues:
1) The inner right rear backup sensor works intermittently and will show red on the display numerous times (I have photos of it). Very intermittent.
2) The front collision alert is not working. They dealer told me it had a bug on it but it is still not working
3) The headlight thing comes and goes. Same thing as yours...3 blinks and then rapid flash like a bulb is burnt out
4) Yesterday, the heads-up display kept showing a previous instruction despite the navigation giving a different instruction (I have video of that)
5) Today the left paddles on the steering wheel would not change the channel on the radio
The dealer claims that there are no codes showing on the computer when I have returned it to them.
The infotainment system is also having issues like locking up or not taking commands as well.
I have been documenting each and every occurrence in a logbook. I am very, very disappointed in this. I bought the top of the line and paid premium money for this. If I don't get a response and resolution soon, I am going to go another route.
BTW, there is also a YouTube video of a guy with a 2024 that is doing the same thing. His name on there is "JB Reviews" and the video is titled "First Issue With My 2024 Chevy Silverado 3500LTZ..."
If you get a resolution, please let me know and I'll do the same.