The setting "Export new or updated grades only" in the gradebook export xml format is only handled in the preview, not in the file.
- Go to the gradebook in a course with some graded activity
- Be sure to have an ID for each activity and for the course category in the gradebook
- In the export section, select the XML format
- Be sure to select "Export new or updated grades only"
- Click Submit
- The preview will only show the new or updated grades as expected
- Click Download
Expected result: The exported file should only contain new or updated grades.
Actual result: The file will include all grades, not only the new or updated grades, which is wrong.