Did I take this concept too far or is this a bug?

[Ed Balduf]

I have a large playbook, which creates groups of VMs in a cloud and each VM needs some number of data volumes attached. I attempted to make it as modular as possible and started using roles and include_roles in loops. To do this, I have a role which loops over an include_role for the VMs and then that VM role loops over an include_role for the Volumes.  The problem is that the variable for the VM name doesn't get passed properly through the second loop to be used in the volume creation role. Should it? 

basically it looks something like this:

role1

  loop1: var1

    include: role2

      include: role3

        loop2: var2

          include: role4

The first pass through loop1 everything is fine.  The second (and subsequent) passes when you print var1 in role4 you still get var1 set to what it was for the first pass. Here is all the code from a boiled down example (with output):

test.playbook

- hosts: localhost

  connection: local

  gather_facts: false

  vars:

    variable1: default

    the_items:

    - name: item1

  roles:

    - role_1 

roles/role_1/tasks/main.yml

- name: "Role_1_inc_2"

  include_role:

    name: role_2

  vars:

    variable1: "{{ item }}"

  with_sequence: count=2 format="Outer%02x"

roles/role_2/task/main.yml

- name: "role_2_inc_3"

  include_role:

    name: role_3

roles/role_3/tasks/main.yml

- name: "role_3_inc_4"

  include_role:

    name: role_4

  vars:

    r4_name: "{{ a_item.name }}"

  with_items: "{{ the_items }}"

  loop_control:

    loop_var: a_item

roles/role_4/tasks/main.yml

- debug:

    msg: "role_4: {{ variable1 }} - {{ r4_name }}"

output: 

PLAY [localhost] ***********************************************************************************************************************************************************************

TASK [role_1 : Role_1_inc_2] ***********************************************************************************************************************************************************

TASK [role_3 : role_3_inc_4] ***********************************************************************************************************************************************************

TASK [role_4 : debug] ******************************************************************************************************************************************************************

ok: [localhost] => {

    "changed": false,

    "msg": "role_4: Outer01 - item1"

}

TASK [role_3 : role_3_inc_4] ***********************************************************************************************************************************************************

TASK [role_4 : debug] ******************************************************************************************************************************************************************

ok: [localhost] => {

    "changed": false,

    "msg": "role_4: Outer01 - item1"

}

Notice the Outer loop variable is stuck at 01 for both loops.   

ansible-playbook --version

ansible-playbook 2.3.0.0

  config file = /etc/ansible/ansible.cfg

  configured module search path = Default w/o overrides

  python version = 2.7.13 (default, Dec 18 2016, 07:03:39) [GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)]