First time I've seen an "exclamation point" symbol on a Waymo LiDAR, over-sensitive crash detection?

The context is basically as you see in the video. A Camry driver perfectly inches past a Waymo to turn right on red, the Waymo begins displaying an exclamation point symbol on its top LiDAR, and then pulls over. Right after the video ends, I simply drove past it. I didn't hear any warning noises or speech from the Waymo exterior speaker, but maybe the Camry still triggered some collision detection and the Waymo decided to pull itself off of the road. Or maybe it was a coincidence!

(And of course, all the flickering on the LiDAR and Jaguar turn signals is only in-camera. It all looked steady to my eyes.)