Haven't seen this effect on the rear camera.
“The truth is out there...”
It happens when you are around LED lighting. You'll see this often when you look at the LED headlights of other cars in your rearview monitor.
Aliens for sure
“When convention and science offer us no answers, might we not finally turn to the fantastic as a plausibility?”
That it's what happens when a light source is strobing at a rate very close to the scan rate of the CMOS camera.
Build a WALL!
Build a DOME!!!
Build on MARS!!!