Test Case Import not mapping user custom field

Description
Test Case Import not mapping user custom field. Using the importer of Jira, the user custom field is being populated.

How to reproduce

1. Create a Jira User Custom Field;
2. Create a CSV where you pass information of the user to be mapped into the field;

Actual result/Attachments
The field is not being populated.

Expected result
The Test should be created with the field filled.