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There is checkbox for choosing whether Blender should recalculate vertex normals or whether to use normals from the data. Using vertex normals from the data can in some cases lead to artefacts. This is probably caused by sharing of vertices across several faces (I didn't find a way how to specify vertex normals per face use of vertex; there is just API for setting normals to vertices). If you select "recalculate vertex normals" (default), this sets faces to use smooth shading, which upon subsequent mesh update computes correct vertex normals (but it will lose eventual smoothing groups baked in vertex normals).