Reimporting an FBX causes invalid collision on Spline Mesh Components (Chaos)

Reported in UDN: [Link Removed]

Reimporting a static mesh asset from an FBX file causes collision to disappear on spline meshes referencing the static mesh asset.

In investigating this in 4.27, I noticed that USplineMeshComponent::RecreateCollision() gets called twice during the FBX reimport process. And later in FKAggregateGeom::GetAggGeom() and FKConvexElem::DrawElemWire() although the ConvexElem appears to have the correct values, the underlying PhysX collision structure has been reset to default values. In 5.0, crash occurs within Chaos source.

Steps to Reproduce:

1. Enable Show->Collision (Alt+C)
2. Add a new Spline Mesh Actor to the scene
3. Import the attached SplineMesh_Original.fbx to the content browser
4. Assign SplineMesh_Original to the static mesh slot on the SplineMesh Actor and note the collision box
5. Right click on SplineMesh_Original and click Reimport with New File, and select SplineMesh_Updated.fbx

Result

Crash occurs upon reimport.

Expected

The collision box is updated to represent the collision for the spline mesh based on the reimported static mesh.

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