In fact, when rotating the view, the blocks appear sometimes with the proper shading, sometimes darker.
It produces a funny glittering effect.
I reported this about 9 years ago already by the way, which gives an idea of how much love blocks are given, and don’t get me started on the crummy “block manager” and block editing which is still mostly some kind of haphazard hack.
Oh ! and there’s also the silly selection highlight bug.