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Ansible gluster_volume fails during probe peer

I am hitting the same problem with (which used to work)

- name: Create Gluster volume
  gluster_volume:
    name: "{{ volume_name }}"
    state: present
    host: "{{ inventory_hostname }}"
    bricks: "{{ brick_dir }}/{{ brick_name }}"
    cluster: "{% for host in workers %}{{ host }},{% endfor %}{{ inventory_hostname }}"
    replicas: "{{ workers|length + 1 }}"
    force: true

The above does not work because Gluster fails to probe inventory_hostname (the master), as can be witnessed by running the probe manually on the remote machine:

$ ssh glustermaster.example.com
$ sudo gluster peer probe $(hostname)
peer probe: failed: glustermaster.example.com is either already part of another cluster or having volumes configured  

Using localhost instead of inventory_hostname

- name: Create Gluster volume
  gluster_volume:
    name: "{{ volume_name }}"
    state: present
    host: "{{ inventory_hostname }}"
    bricks: "{{ brick_dir }}/{{ brick_name }}"
    cluster: "{% for host in workers %}{{ host }},{% endfor %}localhost"
    replicas: "{{ workers|length + 1 }}"
    force: true

makes the probe succeed, but fails during the next volume create step:

Please provide a valid hostname/ip other than localhost, 127.0.0.1 or loopback address (0.0.0.0 to 0.255.255.255)

Omitting the master altogether

- name: Create Gluster volume
  gluster_volume:
    name: "{{ volume_name }}"
    state: present
    host: "{{ inventory_hostname }}"
    bricks: "{{ brick_dir }}/{{ brick_name }}"
    cluster: "{% for host in workers %}{{ host }},{% endfor %}"
    replicas: "{{ workers|length + 1 }}"
    force: true

fails because the replica count then does not match the cluster list length:

number of bricks is not a multiple of replica count
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