When an external tool returns a grade for a student, conditional activities that depend on that grade are not made available until the student logs out and logs back in again.

To reproduce:

1. Create a new course.
2. Add an external tool activity that returns a grade.
3. Add another activity and set a grade condition based on the grade returned from the external tool.
4. Launch the external tool activity as a student and achieve the required score.
5. Return to the course.

Expected result: The restricted activity should be available.

Actual result: The restricted activity is still unavailable. After logging out and then logging back in the restricted activity is available.