Bad FBX mesh

Rhino Rhino for Windows
, , , ,
1

Original mesh:

Viewport with original mesh
Viewport with original mesh1925×869 55.5 KB

2024-02-22_original_mesh.3dm (87.2 KB)

Exported to FBX:

Viewport with exported mesh
Viewport with exported mesh1945×862 40.6 KB

2024-02-22_exported_mesh.fbx (30.8 KB)

Note the missing face. In the actual model, this happens all over the place where the model touches the ground.

Can this be avoided? Should I report this as a bug somewhere?

Upgraded to SR4 yesterday, and the issue persists:

Version 8 SR4
(8.4.24044.15001, 2024-02-13)
Commercial
2

This bug is still in:

Version 8 SR6
(8.6.24101.5001, 2024-04-10)
Commercial

How to report it?