[ansible-project] include_vars overrides subsequent role's vars/main.yml

[t goto]

Hello, experts.
Let me ask you about weird behavior between include_vars and role variable.

I have a couple of roles, "test_before" and "test_after"
.
`-- test_before
    |-- tasks
    |   `-- main.yml
    `-- vars
        `-- RedHat.yml
|-- test_after
|   |-- tasks
|   |   `-- main.yml
|   `-- vars
|       `-- main.yml



First role reads OS specific variables.
Main task file and OS specific variable file follow.

test_before/tasks/main.yml
---
- name: Add the OS specific variables
  include_vars: "{{ ansible_os_family }}.yml"


- debug: message="{{item}}"
  with_items: packages


test_before/vars/RedHat.yml
---
packages:
  - alpha
  - bravo



On the otherhand, second role reads role's main.yml like following.

test_after/tasks/main.yml
---
- debug: message="{{item}}"
  with_items: packages


test_after/vars/main.yml
---
packages:
  - yankee
  - zulu



I intended running those roles displays "alpha, bravo" from first role, 
then "yankee, zulu" from second role, but both role display "alpha, bravo", 
just like second role didn't read vars/main.yml.

PLAY [override test] 
**********************************************************


TASK: [test_before | Add the OS specific variables] 
**********************************
ok: [10.10.14.3]


TASK: [test_before | debug message="{{item}}"] 
***************************************
ok: [10.10.14.3] => (item=alpha) => {
    "item": "alpha",
    "msg": "Hello world!"
}
ok: [10.10.14.3] => (item=bravo) => {
    "item": "bravo",
    "msg": "Hello world!"
}


TASK: [test_after | debug message="{{item}}"] 
*********************************
ok: [10.10.14.3] => (item=alpha) => {
    "item": "alpha",
    "msg": "Hello world!"
}
ok: [10.10.14.3] => (item=bravo) => {
    "item": "bravo",
    "msg": "Hello world!"


Is my intention wrong or there's something else I should've look after?
Thank you.

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