The lighting under birch trees is way darker than it should be. This is not only a visual artifact, since the actual skylight values themselves are incorrect (see screenshots). This doesn't seem to happen under other kinds of trees.

It can be fixed locally by updating the lighting values in the specific region (i.e. placing a torch, see screenshot). It is also fixed upon a reload of the world. But it can reoccur when sleeping the night. So it seems the problematic areas don't get properly updated during the switch and keep their values from dusk, or something like that.