SetNiagaraStaticMeshComponent in UNiagaraFunctionLibrary does not add NiagaraVariable to InstanceParameterOverrides

The result of the Set Niagara Static Mesh Component (OverrideSystemUserVariableStaticMeshComponent) function provided by the UNiagaraFunctionLibrary is different from the operation result on the details panel of the editor. Specifically, when using the above function, SetParameterOverride is not executed, so Variable is not added to InstanceParameterOverrides of UNiagaraComponent.

The following code will fix this issue.

void UNiagaraFunctionLibrary::OverrideSystemUserVariableStaticMeshComponent(UNiagaraComponent* NiagaraSystem, const FString& OverrideName, UStaticMeshComponent* StaticMeshComponent)
{
   ...
 
   // add start
   FNiagaraVariant NiagaraVariant(StaticMeshInterface);
   NiagaraSystem->SetParameterOverride(Variable, NiagaraVariant);
   FPropertyChangedEvent PropertyChangeEvent(UNiagaraComponent::StaticClass()->FindPropertyByName("InstanceParameterOverrides"));
   NiagaraSystem->PostEditChangeProperty(PropertyChangeEvent);
   // add end
 
   StaticMeshInterface->SetSourceComponentFromBlueprints(StaticMeshComponent);
} 

1. Open attached project
2. Remove FXS_CloudParticles of SM_Cloud_A
3. Select SM_Cloud_A
4. Open EUW_CloudParticles with RunEditorUtilityWidget 
5. Press SPAWN FX
6. PIE

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