KBART export omits column headers/field names

Overview:
Steps to Reproduce:

1. Add a resource (from internal KB) to an agreement

2. View agreement and open Agreement lines accordion

3. In "E-resources covered by this agreement", use "Export as ..." and choose KBART

4. Notice that exported KBART file contains no column headings/field names in the first row

Expected Results:
The KBART field names should be in the first row

Actual Results:
First row is empty - no field names

Additional Information:
This was working in the Goldenrod release. Wonder if this is a Grails 4 change?

Interested parties:
@Felix Hemme