This is indirectly related to a test case that occurred in https://tracker.moodle.org/browse/MDL-78990

I'm not sure if this should be logged as an improvement rather than a bug.

When you don't want to set an end date for self enrolment, it instead uploads with the same date as defined in startdate.

Replication:

1. Assuming you are using sandbox.moodledemo.net, go to site admin -> Courses -> manage courses and categories
2. Create a new category and note the ID of it (Typically will be '2')
3. Go to site admin -> Courses -> Upload Courses
4. Use the following CSV in a file

   1. shortname,fullname,category,enrolment_1,enrolment_1_name,enrolment_1_role,enrolment_1_startdate,enrolment_1_enddate

      uploadtest28,uploadtest28,2,self,Student Self Enrol,student,1/30/2024,0

1. Upload the course, navigate to it, then view the settings for the new enrolment method created.

Observed: The end date is not disabled and has the same date as the start date

Expected: The end date should be disabled