Is it normal for right pillar camera to warn about obstruction at night?

So I’m enjoying exploring my new Model Y!!!

However I noticed that driving at night on dark country roads, I invariably see a warning that my right pillar camera may be obstructed. This doesn’t happen in daytime, and granted the right pillar may not be able to see much in the dark. However I don’t see any obstructions and cleaning it doesn’t make a difference.

So is this normal or a problem I need to have Tesla look at?