During one of my last Waymo rides the car stopped on Powell between Bush and Sutter (facing South stopping on the regular lane a bit before the Powell/Sutter crossing). This caused other drivers to drive on the cable car tracks to go around the Waymo (which are separated from the driving lane with a double yellow line) and it caused a truck to do a right turn directly from the cable car tracks (as there wasn't enough space to merge back into the lane).
Not sure if was legal or not for the Waymo to stop there, but given that Waymo stops take quite a bit longer than stops with Uber/Lyft (as it takes a while for the car to continue driving) this was one of the worst places possible to stop. Especially as there would have been space available right after the crossing next to Walgreens.