We just did a light bleed test and that's conclusive. I'm going to tear down one of the units to find the root cause but that's largely pointless because it's a sealed unit so nobody in warranty will want to carry out a DIY fix, and those out of warranty would probably find it too difficult to do but it's just interesting for me to see what's happening. Maybe we'll find a way to do it which isn't too destructive? I'll know in a few days.
Here's the result with the camera blacked out.
View attachment 751779
The gaffer tape is over the top of a thinner black adhesive tape you can't see clearly in the photo, so it may look like the top of the camera lens isn't covered, but it is. I can't think of an easy software fix for this but maybe the clever people at Tesla will.