can you explain me the detailed steps you're doing so I can try to reproduce it?
E.g. this is what I did:
- Open the assign and go to a student's submission (not graded).
- Click to edit feedback.
- Edit the feedback and click "Done" in the feedback page. I'm back to the user submission, the feedback hasn't been sent yet.
- Set a grade to the submission and click "Done" in the submission page. The data is sent and the feedback is saved. Now the submission is graded.
- Click to edit the feedback again, edit the text and click "Done" in the feedback page. I'm back to the user submission, feedback hasn't been sent yet.
- In submission page, I cannot click "Done" because the grade hasn't changed, so the feedback is never sent. I need to change the grade to be able to send the feedback.