Switching AnimLayer to child AnimBP doesn't trigger inertial blending

static void CollectBlendOptionsRecursive(UAnimBlueprintGeneratedClass* AnimBlueprintGeneratedClass, UStruct* Parent)
{
	if (Parent == nullptr)return;
	CollectBlendOptionsRecursive(AnimBlueprintGeneratedClass, Parent->GetSuperStruct());
	UAnimBlueprintGeneratedClass* ParentClass = Cast<UAnimBlueprintGeneratedClass>(Parent);
	if( ParentClass == nullptr )return;
	for (auto& Item : ParentClass->GetGraphBlendOptions() )
	{
		AnimBlueprintGeneratedClass->GraphBlendOptions.Add(Item.Key, Item.Value);
	}
}

void FAnimBlueprintCompilerContext::FinishCompilingClass(UClass* Class)
{
...
	for (UEdGraph* Graph : Blueprint->FunctionGraphs)
	{
		AddBlendOptions(Graph);
	}

	CollectBlendOptionsRecursive( AnimBlueprintGeneratedClass, AnimBlueprintGeneratedClass->GetSuperStruct() );

	for (FBPInterfaceDescription& InterfaceDesc : Blueprint->ImplementedInterfaces)
	{
		if (InterfaceDesc.Interface->IsChildOf<UAnimLayerInterface>())
		{
			for (UEdGraph* Graph : InterfaceDesc.Graphs)
			{
				AddBlendOptions(Graph);
			}
		}
	}

	Super::FinishCompilingClass(Class);
}