My PC is not linked to my Subnet, why?

Opening VpcDetails, on the web console, and clicking on my VPC , I can see my VPC and the only subnet I created. But they are not linked toghether as usual. I mean: there is a link between subnet and route table and between route table and internet gateway I expect there is a link between vpc and subnet. What I am missing?

My Vpc is 10.0.0.0/16 2a05:d01a:344:4900::/56

My Subnet is 10.0.1.0/24 2a05:d01a:344:4900::/64

This into the template

  VPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: 10.0.0.0/16
      EnableDnsSupport: true
      EnableDnsHostnames: true
      Tags:
        - Key: Name
          Value: VPC

  PublicIpv6SubnetA:
    Type: AWS::EC2::Subnet
    Properties:
      # CidrBlock: 10.0.1.0/24
      # ogni interfaccia di rete creata in questa subnet riceverà un ipv6
      AssignIpv6AddressOnCreation: true
      Ipv6Native: true
      Ipv6CidrBlock: !Sub
        - ${VpcPart}${SubnetPart}
        - SubnetPart: 00::/64
          VpcPart: !Select
            - 0
            - !Split
              - 00::/56
              - !Select
                - 0
                - !GetAtt VPC.Ipv6CidrBlocks
      AvailabilityZone: !Select
        - 0
        - !GetAZs ""
      VpcId: !Ref VPC
      # questa voce non si sa se erva
      # EnableDns64: true
      Tags:
        - Key: Name
          Value: Public IPV6 Subnet A