I agree with you that PR is unusually important in this war. For comparison, the Nazis exploited civilian casualties (in occupied territories) of allied bombing in their propaganda. But that didn't have much effect in the scheme of things. In this conflict you see it has an effect on arms deliveries, etc, though not as substantial as Iran might have hoped.

But even is preventing bad UN reports is a covert war goal, bombing UN facilities is predictably counterproductive - it draws more attention than the reports themselves. So I'm skeptical that the IDF would bother spending the (reconnaissance) resources.