Ultimate Customizer Login Page gets broken with Xporter enabled

Description
Using the Ultimate Customizer app (https://marketplace.atlassian.com/apps/1216144/ultimate-customizer-jira-service-management?hosting=server&tab=overview) to customize the Jira Service Desk login page gets broken when enabling Xporter, and the customization no longer works.
Using Jira version 8.20.11, it shows the following error on the Login page:

How to reproduce

1. Install the Ultimate Customizer app
2. Create customization for the Jira Service Desk login page
3. Enable Xporter

Actual result/Attachments
The login page customization will disappear, and it will show the default login page

Expected result
It should allow using the customization login page

Version

• Jira version 8.20.11
• Ultimate Customizer latest available