"According to police, a Honda sedan traveling eastbound on Chandler Boulevard had to swerve to avoid striking a vehicle traveling northbound on Los Feliz Drive. As the Honda swerved, it continued eastbound into the westbound lanes of Chandler Boulevard and hit the Waymo van."

Waymo car appears to not be at fault.

Waymo posted a video from the van. Pretty much answers all questions about what happened.

https://www.youtube.com/watch?v=KhcyTOaHdv4

“Waymo car hit by a vehicle in Chandler”.

But hey, you gotta spin that title as much as you can waiting for the third paragraph to reveal the self-driving car was not at fault.