I think it just assumes it’s blocked if can’t get any image for a certain amount of time. I had siniliar issueas on darker roads here in Switzerland. Comes and goes though and everything still works fine. Don’t think it can differentiate between darkness and obstruction.

Just got my Model Y with Hardware 4 this week, interested in seeing if that makes a difference as visibility in low light seems to be a ton better than on my HW3 Model 3. I‘ll let You know if anything changed :-)

Down in Australia, I get the exact same thing for my left pillar. Since it created an alert, I presumed the car wanted me to pay attention to it, so I contacted support who told me it’s normal and safe to ignore.

It makes sense because the camera is effectively seeing a black image. On a dark country road, that’s totally expected. But most of the time it would probably have some kind of image, in which case you want to warn about a black image in case the camera is faulty which could be a safety issue.

For the cases where the driver knows it’s supposed to be dark, it’s reasonable to apply common sense and ignore that specific occurrence of the alert.

It can be blocked by glare from lights as well. As long as it’s clean you should be good.

Have you tried to recalibrate the cameras?