AWS::ApiGatewayV2::VpcLink forward-deployed on dependency stack instead of its own stack

[icelava]

https://repost.aws/questions/QUVCECvtYoRCK71OAZ0bxS9w/cdk-forward-deploying-resource-from-another-stack

We have our own library of playbook L3 constructs when deploying with CDK. One of them a composite arrangement of ASG, ALB, with options for CloudFront, WAF, public HTTP API Gateway, etc. This construct type is meant to be deployed as part of an application layer stack, which has dependency on a base stack that covers the fundamental infrastructure resources like VPC, security groups, S3 buckets, etc.

When running cdk diff and deploy of the base stack of a brand new system environment, I noticed the VPC link of the API Gateway AWS::ApiGatewayV2::VpcLink of the above-mentioned construct has somehow found its way into the template of the base stack instead of the yet-to-be-deployed application stack.

[+] AWS::EC2::Subnet SYSTEM-vpc-ENVIRONMENT/vpc/cacheSubnet3/Subnet SYSTEMvpcENVIRONMENTvpccacheSubnet3SubnetC364FB30
[+] AWS::EC2::RouteTable SYSTEM-vpc-ENVIRONMENT/vpc/cacheSubnet3/RouteTable SYSTEMvpcENVIRONMENTvpccacheSubnet3RouteTableFB233B7C
[+] AWS::EC2::SubnetRouteTableAssociation SYSTEM-vpc-ENVIRONMENT/vpc/cacheSubnet3/RouteTableAssociation SYSTEMvpcENVIRONMENTvpccacheSubnet3RouteTableAssociationCCCE2449
[+] AWS::EC2::InternetGateway SYSTEM-vpc-ENVIRONMENT/vpc/IGW SYSTEMvpcENVIRONMENTvpcIGW9869729D
[+] AWS::EC2::VPCGatewayAttachment SYSTEM-vpc-ENVIRONMENT/vpc/VPCGW SYSTEMvpcENVIRONMENTvpcVPCGWECCB19DC
[+] AWS::ApiGatewayV2::VpcLink SYSTEM-vpc-ENVIRONMENT/vpc/SYSTEM-App-vpc-link-ENVIRONMENT/SYSTEM-App-vpc-link-ENVIRONMENT SYSTEMvpcENVIRONMENTvpcSYSTEMAppvpclinkENVIRONMENT55F63713
[+] AWS::EC2::SecurityGroup SYSTEM-vpc-ENVIRONMENT/vpc/SYSTEM-App-vpc-link-sg-ENVIRONMENT SYSTEMvpcENVIRONMENTvpcSYSTEMAppvpclinksgENVIRONMENT6BCED9EA
[+] AWS::EC2::SecurityGroup SYSTEM-bastion-host-SG-ENVIRONMENT SYSTEMbastionhostSGENVIRONMENT7DE50118
[+] AWS::SNS::Topic SYSTEM-operator-topic-ENVIRONMENT SYSTEMoperatortopicENVIRONMENTDDD12BF6
[+] AWS::SNS::Subscription SYSTEM-operator-topic-ENVIRONMENT/[email protected] SYSTEMoperatortopicENVIRONMENT6BB1089F
[+] AWS::SNS::Subscription SYSTEM-operator-topic-ENVIRONMENT/[email protected] SYSTEMoperatortopicENVIRONMENTF6CC5213
[+] AWS::SNS::TopicPolicy SYSTEM-operator-topic-ENVIRONMENT/Policy SYSTEMoperatortopicENVIRONMENTPolicyFB7F9EC7

What can cause CDK to shift a resource from a dependent stack into a dependency stack? This is not desired behaviour.