Describe the bug
The new assignment creation page, see below, has lost the following functionality
- detect repository names from GitHub
- allow custom prefix

To Reproduce
Steps to reproduce the behavior:
- Go to Create Individual Assignment
- Click on pen icon next to repository prefix
- Also enter repository name for starter code
Expected behavior
- The custom prefix seems to get lost each time I come back to the page, e.g. to change some setting. This should not happen.
- The starter code field does not automatically detect repository names. It should.
- Sometimes, entering all the fields and clicking on 'Create Assignment' just reloads the page with some of the settings lost and no assignment created.
- Other times, it gives a 404 error.

Additional context
It seems the new page has been deployed without proper testing. Today is the assignment release data and I am panicking.