Ansible Unity Volume Module - gather volume details

I am trying to use the volume module to gather volume facts but it fails on non thin provisioned volumes. It is defaulting the parameter 'is_thin' to True when not specified and gives the error 'Modifying is_thin is not allowed'.

Is there a way to get around this by not having that parameter default to a value?

- name: Get volume details using vol_name
dellemc.unity.dellemc_unity_volume:
unispherehost: "{ { inventory_hostname }}"
username: "{ { user }}"
password: "{ { password }}"
verifycert: False
vol_name: "{ { volume_name }}"
state: "present"
register: output