Filtering on course not working on lab overview page

Summary

When attempting to filter on one of the courses (e.g. Introduction to Programming) in a shared lab, this does nothing and all requests are still shown. When applying another filter (e.g. for a specific assignment) this does seem to work just fine.

Steps to reproduce

1. Go to a lab page for a lab with multiple courses like this one
2. Attempt to filter on a course (e.g. Introduction to Programming).

Current behaviour

No filtering whatsoever appears to happen. Other filtering parameters appear to work as expected.

Expected behaviour

Only requests for the course(s) selected in the filter are shown once the filter is applied.

Screenshots