Have been running the latest software release for a bit now 2022.44.3I also had this, Model 3 2021. I thought I was going crazy as our Model Y was normal. But lo and behold, with the new update, I got my regen back! Woohoo!
No differences I am afraid. I cannot one peddle drive the car anywhere, on a mountain or the city. I would consider it way too dangerous. I am always hovering my foot over the brake peddle as soon as releasing the accelerator.
If I take my foot completely off the accelerator on flat road, the car will just coasts along, slowly slowly to a stop, but obviously this is only possible if I have sufficient empty road in front.
You can watch the speedo count down kph by kph as it coasts.
So looks like for me, I just have to live with it. I have just lost one of the best things about the car.