ID 477355 - Alembic geometry exports with no vertex normals

Problem summary
Alembic geometry exports with no vertex normals

Customer reported version
Mari 4.7v2

Customer reported platform
CentOS 7

Steps to reproduce

1) Create a mesh with smooth shading in a 3D app, and export as an Alembic file (or use the attached file)

2) Create a new project in Mari with the Alembic mesh

3) Export the mesh as an OBJ by running the following Python script:

4) Import the new, exported mesh into a 3D app to view the shading

Expected behaviour
The exported mesh should have smooth shading.

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Actual behaviour
The exported mesh is flat-shaded, appearing faceted.

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Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
Mari 4.7v2 - Windows 10 - CentOS 7.7
Mari 4.7v1 - Windows 10
Mari 4.6v1 - Windows 10
Mari 4.5v1 - Windows 10
Mari 4.2v1 - Windows 10
Mari 3.4v1 - Windows 10
Mari 3.3v1 - Windows 10 - CentOS 7.7

Earliest version tested
Mari 3.3v1 - This issue appears to be in all versions of the product