This happened 2 years ago. It was a left-hand exit (why are those even a thing?). The seperator did not have contracting protectors because a car had previously crashed into them, I wonder why. No one ever dies in car accidents. Hence, Tesla is super bad for marketing its autopilot according to HN.
At this interchange, I've seen lots of human drivers change between the exiting HOV lane and the continuing HOV lane (or vice versa) much later than is safe; presumably because they were surprised that their lane was exiting, or they noticed the exit too late, but didn't want to miss it. I haven't seen anyone drive in between the two lanes as if it was a lane, though; and usually the late lane changers are braking, not accelerating.
It is unfortunate that the crash attenuator wasn't reset. Looking at the docs for a similar attenuator[1], it seems like resetting is somewhat involved, and you'd need a trained and properly equipped repair crew to do it, even if the time required is not that much. Scheduling is probably an issue.
[1] https://www.dmtraffic.com/assets/sci_smart_cushion_design_an... page 9-13