Hello - Assistance requested with stdout_lines output.

I have some tasks that take diff results of two files and then writes the 
output to a log.

Code Snippet:
- name: Gather diff output of deployed changes
  command: "diff {{ deployed_copy_output.dest }} {{ 
deployed_copy_output.backup_file }}"
  register: diff_output
  failed_when: diff_output.rc > 1

- name: Log diff changes
  blockinfile:
    dest: "{{ log_dir }}/{{ pb_diff_logname }}"
    content: |
      {{ app_log_header }}
      Command: 'diff {{ deployed_copy_output.dest }} {{ 
deployed_copy_output.backup_file }}'
      {{ diff_output.stdout_lines }}
      {{ app_log_footer }}
    create: yes
    insertafter: EOF
    marker: "{{ app_log_marker }}"

This results in output that looks like the below. 

> **********
> Command: 'diff /opt/wmspt/.profile 
> /opt/wmspt/.profile.2016-12-28@23:06:41~'
> [u'2a3', u'> echo hi']
> **********


I would expect it to look more like the debug output:

> TASK [role_config_shared_profile : debug] 
> **************************************
> ok: [ptl01a0fap006] => {
>     "diff_output": {
>         "changed": false, 
>         "cmd": [
>             "diff", 
>             "/opt/wmspt/.profile", 
>             "/opt/wmspt/.profile.2016-12-28@23:27:24~"
>         ], 
>         "delta": "0:00:00.111675", 
>         "end": "2016-12-28 23:27:25.068251", 
>         "failed": false, 
>         "failed_when_result": false, 
>         "rc": 1, 
>         "start": "2016-12-28 23:27:24.956576", 
>         "stderr": "", 
>         "stdout": "2a3\n> echo hi", 
>         "stdout_lines": [
>             "2a3", 
>             "> echo hi"
>         ], 
>         "warnings": []
>     }
> }  


Writing the stdout_lines has some sort of list syntax with 
[u'text1',u'text2'], even though debug the same info is correct multiline 
output. Is there something that I'm missing here?

Thanks

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