There was a good analysis of this elsewhere that effectively boiled down to how the tech being used (I want to say LIDAR, but it could have been lasers or camer

There was a good analysis of this elsewhere that effectively boiled down to how the tech being used (I want to say LIDAR, but it could have been lasers or cameras) had evolved. It's apparently really good at detecting how fast other objects are going, and really bad (or, at least, not designed well in its current state) at detecting stationary objects, since it's primarily been trained to ignore the millions of stationary objects all around it throughout a drive to be able to focus on moving objects (cars, pedestrians, bicyclists, etc). Apparently, moving and stationary objects are treated differently, and both have to be intentionally trained, and that this was a case of seeing the stationary object but ignoring it, just like it does with most other stationary objects that aren't in the road. I'm not technical enough to go into specifics, but that's the gist from the article I saw-but-can-no-longer-find.