Im not sure what you mean. Are you talking about walking under a tree or going inside a POI where the windows are all barricaded and there are not any light sources? If the former. I haven’t seen that, myself, and if the latter, it’s intended for you to either use a head lamp, a flashlight, or break open the windows to let light in, or stumble around in the dark.
Perhaps your brightness setting is too low for your preferences? I usually turn mine down to 15% so that dark areas and nighttime are actually dark. You say that shade is like nighttime but there have been a lot of posts that nighttime, itself, is too bright at default brightness levels for a lot of people and that we can see too far and too well in the dark.
What’s your brightness level set at and what exactly are you meaning by walking into shaded areas? What shadow setting are you using?