[4.1.0.0] Customer Custom Fields do not populate

[Dave H]

In the latest opencart-master the customer custom fields do not populate on admin/view/template/customer_form.twig

Root cause:
In admin/controller/customer/customer.php line: 601
$data['account_custom_field'] = $customer_info['custom_field'];
Solution:
Change line 601 to
$data['account_custom_field'] = json_decode($customer_info['custom_field'],true);

This was working in 4.0.2.3 which is listed as the most recent release, downloading the latest master shows version 4.1.0.0, not sure if I'm doing something wrong here!