C++ Shipped Version: Create Actors at Runtime doesn't show in the App but in Editor mode yes.

Development Programming & Scripting C++
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5 
void AUActorDrawable::instanceMeshAndGeorefAndOthers(UStaticMesh* Mesh, ACesiumGeoreference* cesium_georeference_act,FName name_mesh, UMaterialInterface* matr)
{

	if (Mesh != NULL)
	{
		//UStaticMesh * mesh_instance = DuplicateObject<UStaticMesh>(Mesh, this, name_mesh);
		//UStaticMeshComponent* mesh_instance = NewObject<UStaticMeshComponent>(Mesh);

		this->MeshComponent->SetStaticMesh(Mesh);

The problem:
By using DuplicateObject<…>(…), the feature is not kept in the Package Version of the project.

Instead, you must use the SetStaticMesh with the reference of the Mesh that you want to instance (it also improve performance because it is used on GPU as instance of the same object and cached).

But i think that DuplicateObject<…>(…) this have a BUG.