The geometry of the building to the NW of this changeset is inaccurate. The building's roof has a bright and shaded part. This is becuase the sun is shining from the North as can be confirmed by the shadows being cast Southward. The footprint you mapped also contains the building's shadow. Buildings can cast shadows on their own walls, but I don't think that is the case in this imagery: it is the easten wall that can be seen.
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            Published using OSMCha: https://osmcha.org/changesets/151845904
            