Exam: Students cannot see in the summary their models -> Communication diagrams

[Santia-go]

Describe the bug

Students cannot see in the summary their models, specifically the Communication diagrams. However, instructors are able to see.

To Reproduce

1. Conduct an exam with communication diagrams. Model it.
2. Verify that after the exam ends, the student sees an empty canvas
3. Verify, as an instructor, that the model exists.

Expected behavior

The student should also be able to see his model in the summary.

Screenshots

No response

Which version of Artemis are you seeing the problem on?

8.4.0

What browsers are you seeing the problem on?

Chrome

Additional context

No response

Relevant log output