ALB Subnets Question about comformation HOT 5 CLOSED

var template = new Template
{
    Parameters = new Parameters
    {
        new Parameter
        {
            LogicalId = "NetworkStack",
            Description = "Name of network stack",
            Type = ParameterType.String
        }
    },
    Resources = new Resources
    {
        new Comformation.CloudFormation.Stack.StackResource
        {
            LogicalId = "WebsiteAndALB",
            Properties =
            {
                TemplateURL = "https://xxxx.yaml",
                Parameters = new Dictionary<string, Union<string, IntrinsicFunction>>
                {
                    { "ALBSubnets", Fn.ImportValue(Fn.Sub("${NetworkStack}-PublicSubnets")) }
                }
            }
        }
    }
};

var template = new Template
{
    Parameters = new Parameters
    {
        new Parameter
        {
            LogicalId = "ALBSubnets",
            Type = ParameterType.SubnetIdList,
            Description = "Choose which subnets the Application Load Balancer should be deployed to"
        }
    },
    Resources = new Resources
    {
        new Comformation.ElasticLoadBalancingV2.LoadBalancer.LoadBalancerResource
        {
            LogicalId = "LoadBalancer",
            Properties =
            {
                Subnets = new List<Union<string, IntrinsicFunction>>
                {
                    Fn.Ref("ALBSubnets")
                }
            }
        }
    }
};

public class LoadBalancerResourceFixed : Comformation.ElasticLoadBalancingV2.LoadBalancer.LoadBalancerResource
{
    public class LoadBalancerPropertiesFixed : Comformation.ElasticLoadBalancingV2.LoadBalancer.LoadBalancerResource.LoadBalancerProperties
    {
        public new Union<IntrinsicFunction, List<Union<string, IntrinsicFunction>>> Subnets { get; set; }
    }

    public new LoadBalancerResourceFixed.LoadBalancerPropertiesFixed Properties { get; } = new LoadBalancerResourceFixed.LoadBalancerPropertiesFixed(); 
}

var template = new Template
{
    Parameters = new Parameters
    {
        new Parameter
        {
            LogicalId = "ALBSubnets",
            Type = ParameterType.SubnetIdList,
            Description = "Choose which subnets the Application Load Balancer should be deployed to"
        }
    },
    Resources = new Resources
    {
        new LoadBalancerResourceFixed
        {
            LogicalId = "LoadBalancer",
            Properties =
            {
                Subnets = Fn.Ref("ALBSubnets")
            }
        }
    }
};