Adding my experience since as many are keen to point out when things are wonk 'it's beta....'.
Previous to this release I had few aborts and usually when a car was coming up from behind, albeit a distance away. Recently however, the car tends to slowly oscillate between lane marking which can be unsettling, and lane changes are unusable/unsafe. It will abort and fly back into original lane even though it was literally what seems like inches from being i correct lane. It's scary and other drivers must keek their pants on seeing it next to them.
I still try now and then but I feel very anxious now, this morning for example it was midway through lanes change, nothing around that I could tell would interfere (I always check), when it bounced back into lane, then back again. I don't know how many times it would have done this as I aborted, but bejeezus !
I'm same commute every day, so it's fairly easy to compare although I'm aware there are still may variables such as time of day, weather etc.
ps. I know it's beta, yes it will get better, etc. but that also makes is willing QA Testers so these posts may be important info.