ec2_vpc_route_table not working with NAT gateways

[Dean Mills]

Having troubles trying to setup the route tables in a VPC with a NAT gateway as the target.

- name: Create Private B route tables
    ec2_vpc_route_table:
      vpc_id: '{{ vpc_id }}'
      region: '{{ vpc_region }}'
      subnets:
      - '{{ vpc_subnet_private_b }}'
      routes:
        - dest: 0.0.0.0/0
          instance_id: 'nat-0f0e9840ce4984705'
      resource_tags: { "Name":'Private B' }
    register: vpc_private_b_route_table

The route table is created, but only has the default local route and not the one I am trying to create to the NAT gateway. Any ideas on what is going on or what I am doing wrong greatly appreciated!