Unable to export cucumber test issues with 3 levels of requirements

Unable to export cucumber test issues with 3 levels of requirements.

When exporting a Cucumber Test with 3 levels of requirements, a 500 status code is returned from the Xray API (both public and internal endpoints).

Steps to reproduce:

1. Create a new project, where only the "Task" and "Sub-Task" issue types are mapped to requirements in the Xray settings
2. Create an Epic issue
3. From the Epic issue, create a Task issue
4. From the Task issue, create a Sub-Task issue
5. Create a new Cucumber Test (with some content) and linked it to the "Sub-Task" issue
6. In the Cucumber Test issue, select the option "Xray - Export to Cucumber". An error will be displayed in the UI. - This is not the expected behavior
7. Go back to the Xray settings page and add the Epic issue as a Requirement.
8. Go back to the Cucumber Test issue and export again the issue as a Cucumber file - no error is returned and the feature file(s) are generated correctly.