SubnetSelection: setting onePerAz to true, still returns all subnets from an AZ

[danblacklist]

Describe the bug

When using subnetSelection as below, it still returns all subnets from all AZs whereas it should be returning just one per AZ.

const subnetSelection = {
      subnetType: ec2.SubnetType.PUBLIC,
      onePerAz: true
    }

Even the below returns all subnets from all AZs

const subOne = ec2.Subnet.fromSubnetId(this, "subOne", "subnet-3e92bb31")
    const subnetSelection = {
      subnets: [
        subOne
      ]
    }

I'm unable to find a way to get it to contain just one subnet.

Expected Behavior

It should return one subnet per AZ

Current Behavior

Its returning all subnets from all AZs

Reproduction Steps

1. Create a SubnetSelection with above properties.
2. Use it inside cdk.aws_ecs_patterns.ApplicationLoadBalancedFargateServiceProps for taskSubnets
3. BOOM

Possible Solution

No response

Additional Information/Context

This was also highlighted in a previous issue : #6217

CDK CLI Version

2.59.0 (build b24095d)

Framework Version

No response

Node.js Version

18.12.1.

OS

Mac OS Ventura 13.2

Language

Typescript

Language Version

No response

Other information

No response

[peterwoodworth]

Thanks for raising this issue with us,

We have an open issue tracking this issue here #3126, please refer to that issue and use it for any other concerns. Thanks!

[github-actions]

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