TrailRenderer's Vertex Normal is wrong

The normals of vertices created with the TrailRenderer are all strange. This problem is also seen in the LineRenderer.

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(Unity 2019.3.0f1)

All renderers in the scene have the same material (including the TrailRenderer).

Note that the TrailRenderer's Alignment is set to TransformZ, but the normal of the vertex is abnormal even with the View.

Do I not know how to use TrailRenderer?

 

I checked "Generate Lighting Data", but they all shaded in the same Normal direction regardless of the direction of the vertex.

 

Thank you for the answer.

 

I reported a bug. The case number is 1203456.