When I run the API command (via CiviCRM API Explorer) to list all the "Mailing Lists" i.e.
$result = civicrm_api3('Group', 'get', ['group_type' => "Mailing List"]);
I get the full list of mailing list groups. However if I run the with "LIKE" filtering option instead of "=", i.e:
$result = civicrm_api3('Group', 'get', ['group_type' => ['LIKE' => "Mailing List"],]);
I don't get any results and the console suggests that i hit a 403 error, which indicates this is a permission problem. I am running this as an administrator so I should have full access to the system.
Any suggestions on how to address this issue are welcome.I am running CiviCRM 5.18.4 on Wordpress 5.2.4.