Creating an HLOD with a FallbackMesh that has a section with triangles=0 will incorrectly set the UVs of the StaticMesh

The UVs in HLOD's StaticMesh appear to be broken when there are sections with zero triangles in the fallback mesh. This is most likely the case for sections containing only small parts.

Workaround:

void FMeshMergeHelpers::ExtractSections(const UStaticMeshComponent* Component, int32 LODIndex, TArray<FSectionInfo>& OutSections)
{
	

// ...

	for (const FStaticMeshSection& MeshSection : StaticMesh->GetRenderData()->LODResources[LODIndex].Sections)
	{
		// Skip empty sections
		if (MeshSection.NumTriangles == 0)
		{
//			continue; // remove this continue
		}

1. Download the repro project (HLODTest) from addtional URL
2. Open the editor
3. Delete HLODs
4. Build HLODs

Result:

UVs of StaticMesh are incorrectly set (attached NG_HLOD0, NG_HLOD1)

Expected:

UVs of StaticMesh are set correctly (attached OK_HLOD0, OK_HLOD1)

[UE-23848] Bug Status

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