"base_choices" is not working in custom field choice bulk import

[jordihelp]

Deployment Type

Self-hosted

NetBox Version

v4.2.6

Python Version

3.11

Steps to Reproduce

1. Click in "Bulk import" in "Custom Field Choices"
2. Set data to:

---
name: Choices
description: 
order_alphabetically: False
base_choices: ISO_3166
extra_choices: 

3. Set format to YAML
4. Click "Submit" button

Expected Behavior

A new custom field choice should have been created with the selected base choices.

Observed Behavior

An error "Must define base or extra choices" was raised