Something doesn't sound right with this story. My boss has a Tesla with the latest self driving/parking s/w. Currently the only parking it does is in reverse in between two cars that are parked parallel to each other.
Not sure about the summons feature. I haven't seen that used yet.
Regardless, it just goes to show you that all this automation only works within the limitations of the sensors and software and you really don't know when the limits are going to be reached.
