Ansible 2.8.1: Multiline debug not working with debug output filter

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Hi all,

I am using Ansible 2.8.1 and want to create a multiline debug output at the end of a play run:

https://docs.ansible.com/ansible/latest/modules/debug_module.html

Suggests this is possible, I am trying the following:

- name: Give cluster information
  debug:
    msg:
      - "Information about your deployed AKS cluster:"
      - "Cluster Name : {{ aks_name }}"
[...]

This seems to work as expected by default, however if we specify the debug output filter as an environment variable:

ANSIBLE_STDOUT_CALLBACK=debug

Then the output is not split up onto separate lines, and the information is represented in one large block of text in one line. Has anyone seen this before?

Thanks.
Andrew.