os_server is not idempotent if I use port-id= - Multiple matches found for default

os_server-with-os_port-FAIL.yml

#!/usr/bin/env ansible-playbook
---

- hosts: localhost
  gather_facts: false
  connection: local
  vars:
    iaas_internal_network: admin
    iaas_machine_size: m1.tiny
    iaas_image: cirros-0.4.0
    auth:
      auth_url: "{{ lookup('env','OS_AUTH_URL') }}"
      project_name: "{{ lookup('env','OS_PROJECT_NAME') }}"
      username: "{{ lookup('env','OS_USERNAME') }}"
      password: "{{ lookup('env','OS_PASSWORD') }}"
  tasks:
    - name: Create port #1
      os_port:
        state: present
        auth: "{{ auth }}"
        name: "port-for-instance-bc4493e3fb06f3553447b2b93496a30b"
        network: "{{ iaas_internal_network }}"
        no_security_groups: True
      register: port_info

    - name: Create instance #1
      ignore_errors: yes
      os_server:
        state: present
        auth: '{{ auth }}'
        name: "instance-bc4493e3fb06f3553447b2b93496a30b"
        image: "{{ iaas_image }}"
        flavor: "{{ iaas_machine_size }}"
        nics:
          - "port-id={{ port_info.id }}"

    - name: Create port #2
      os_port:
        state: present
        auth: "{{ auth }}"
        name: "port-for-instance-bc4493e3fb06f3553447b2b93496a30b"
        network: "{{ iaas_internal_network }}"
        no_security_groups: True
      register: port_info

    - name: Create instance #2
      ignore_errors: yes
      os_server:
        state: present
        auth: '{{ auth }}'
        name: "instance-bc4493e3fb06f3553447b2b93496a30b"
        image: "{{ iaas_image }}"
        flavor: "{{ iaas_machine_size }}"
        nics:
          - "port-id={{ port_info.id }}"

    - name: Delete instance
      os_server:
        state: absent
        auth: '{{ auth }}'
        name: "instance-bc4493e3fb06f3553447b2b93496a30b"

    - name: Delete port
      os_port:
        state: absent
        auth: '{{ auth }}'
        name: "port-for-instance-bc4493e3fb06f3553447b2b93496a30b"

os_server-without-os_port-PASS.yml

#!/usr/bin/env ansible-playbook
---

- hosts: localhost
  gather_facts: false
  connection: local
  vars:
    iaas_internal_network: admin
    iaas_machine_size: m1.tiny
    iaas_image: cirros-0.4.0
    auth:
      auth_url: "{{ lookup('env','OS_AUTH_URL') }}"
      project_name: "{{ lookup('env','OS_PROJECT_NAME') }}"
      username: "{{ lookup('env','OS_USERNAME') }}"
      password: "{{ lookup('env','OS_PASSWORD') }}"
  tasks:
    - name: Create instance #1
      ignore_errors: yes
      os_server:
        state: present
        auth: '{{ auth }}'
        name: "instance-bc4493e3fb06f3553447b2b93496a30b"
        image: "{{ iaas_image }}"
        flavor: "{{ iaas_machine_size }}"
        network: "{{ iaas_internal_network }}"


    - name: Create instance #2
      ignore_errors: yes
      os_server:
        state: present
        auth: '{{ auth }}'
        name: "instance-bc4493e3fb06f3553447b2b93496a30b"
        image: "{{ iaas_image }}"
        flavor: "{{ iaas_machine_size }}"
        network: "{{ iaas_internal_network }}"

    - name: Delete instance
      os_server:
        state: absent
        auth: '{{ auth }}'
        name: "instance-bc4493e3fb06f3553447b2b93496a30b"