spec2cdk: Breaking changes in Aws-cdk-lib-java from Tagging Change

[GavinZZ]

Describe the bug

#28989
This PR caused breaking change in aws-cdk-lib-java package since v2.136.0.

public class CdkJavaStack extends Stack {
    public CdkJavaStack(final Construct scope, final String id) {
        this(scope, id, null);
    }

    public CdkJavaStack(final Construct scope, final String id, final StackProps props) {
        super(scope, id, props);

        CfnVPC vpc = CfnVPC.Builder
            .create(this, "MyVpc")
            .enableDnsHostnames(true)
            .enableDnsSupport(true)
            .instanceTenancy("default")
            .build();

        List<CfnSubnet> subnets = new ArrayList<>();
        CfnSubnet subnet = new CfnSubnet(this,
            "PublicSubnets",
            CfnSubnetProps.builder()
                    .vpcId(vpc.getRef())
                    .mapPublicIpOnLaunch(false)
                    .tags(List.of(CfnTag.builder().key("MyKey").value("MyValue").build()))
                    .build());

        subnets.add(subnet);

        System.out.println(subnets.get(0).getTags().tagValues());
        String natGatewayName = subnets.get(0).getTags().tagValues().get("MyKey") + "-NatGateway";
        CfnNatGateway natGateway = CfnNatGateway.Builder
            .create(this, natGatewayName)
            .subnetId(subnets.get(0).getRef())
            .tags(List.of(CfnTag.builder().key("MyKey").value(natGatewayName).build()))
            .build();
    }
}

Expected Behavior

In cdk version v.120.0, the line String natGatewayName = subnets.get(0).getTags().tagValues().get("MyKey") + "-NatGateway"; will correctly generate the name.

Current Behavior

However, in v.136.0, this would result in Null-NateGateway. And it's causing breaking changes.

Reproduction Steps

See above template.

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

v.136.0

Framework Version

No response

Node.js Version

20

OS

MacOS

Language

Java

Language Version

No response

Other information

No response

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