Task fails when using more than one with_items.

[Olof Lundgren]

I have a network module playbook that connect to vyos router and gathers some info. 

---
  - name: play
    hosts: vyos
    gather_facts: no
    connection: local

    tasks:
      - name: vyos facts
        vyos_facts:
          gather_subset: "!config"

      - name: vyos command.
        vyos_command:
          commands:
            - show interfaces ethernet {{ item }}
            - show version
        with_items:
          - eth0
          - eth1

This is my hosts file:

[vyos]
router1
router2

[vyos:vars]
ansible_user=vyos
ansible_ssh_pass=password

When I run the playbook, I get all the info from vyos_facts and vyos_command show interface ethernet eth0

But when it comes to {{ eth1 }} it fails with this message. 

It doesnt continue to the show version part at all. 

$ ansible-playbook vyos.yml
....
failed: [router1] (item=eth1) => {
    "failed": true,
    "item": "eth1",
    "msg": "unable to open shell. Please see: https://docs.ansible.com/ansible/network_debug_troubleshooting.html#unable-to-open-shell",
    "rc": 255
}
...

However, if I define the username and password under vyos_command it succeeds...

---
  - name: play
    hosts: vyos
    gather_facts: no
    connection: local

    tasks:
      - name: vyos facts
        vyos_facts:
          gather_subset: "!config"

      - name: vyos command.
        vyos_command:
          commands:
            - show interfaces ethernet {{ item }}
            - show version
          username: vyos
          password: password
        with_items:
          - eth0
          - eth1

My version:

$ ansible --version
ansible 2.3.1.0