Steps to reproduce:

• Login as admin
• Create a course C
• Create a user S and a user T
• Enrol user S into course C as student
• Enrol user T into course C as editing teacher

• Login as user T
• Go to course C
• Add an assignment activity
  • Set an assignment title of your choice
  • Leave all other settings at their default settings

• Login as user S
• Go to course C
• Open the assignment activity
• Submit a submission

• Login as user T
• Go to course C
• Open the assignment activity
• Open the submission for grading in the annotation interface
• Add some annotations to the submission and note that with every annotation, a "Draft annotations saved" popup appears in the bottom left corner
• Do not click "Save changes" and close the browser tab / go away like if you had forgot to finish your work

• Come back as user T
• Go to course C
• Open the assignment activity
• Open the submission for grading in the annotation interface
• Expected result for user T:
  • The annotations which have been added previously are still there
  • There is a clear status information that the annotations have not been saved yet and that the student will not have access to the annotated PDF yet.
• Actual result for user T:
  • The annotations which have been added previously are still there
  • There is no possibility to tell if the annotations have been saved before and if the student has access to the annotated PDF already or not.
  • The teacher might falsely assume that there is nothing left to do for him, but in fact the student is still missing his annotations