AP1 shows cars in the adjacent lanes, AP2, and newer, do not. (Though it usually shows them when you turn the turn signals on.)
Patience guys, adjacent lane detection is coming soon....
(...)Sources familiar with the matter told Electrek that the only new feature is the ability of Autopilot 2.0 to detect and render on the instrument cluster vehicles driving in lanes adjacent to the lane in which the Tesla vehicle is driving. (...)
Tesla starts beta-testing new Autopilot update with new feature and more advanced neural net
The same will happen sooner or later to blind spot detection.