ID 394726 - Exporting models as an FBX 2018 file results in incorrect hard edges and smoothing groups.

Problem summary
Exporting models as an FBX 2018 file results in incorrect hard edges and smoothing groups.

When using FBX 2018 as the export format, the model isn't exported correctly.

Customer reported version
modo.13.0v1

Customer reported platform
windows10

Steps to reproduce

1) Press F6 to open the Presets browser, then go to Assets>Meshes>Hardward and drag and drop the Arcade model into the scene.

2) In the Items List right-click the model and select Export Selected Layers, select Autodesk FBX 2018 and enable Just Layers then press OK.

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3) This will bring up a Save File window, within this window give a name of your choice and select Save.

4) Compare the two models and notice the differences.

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Expected behaviour
The exported model should match the first.

Actual behaviour

The exported model doesn't match the first.

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:
Modo 13.0v1 - Windows 10

Modo 12.2v2 - Windows 10

Modo 12.2v1 - Windows 10 -regression

Unable to reproduce bug in:
Modo 12.1v2 - Windows 10

Earliest version tested

Modo 12.1v2 - This issue no longer appears in this version and has regressed.