Teacher unable view some hidden activities by switching role to student

In the activities types Feedback, Forum, Glossary and Survey
there is an explicit check for module visibility. It is not needed if require_login() is called properly indicating the $cm.

As a result the activities are not displayed when teacher views them switching the role to student. He sees "Sorry, this activity is currently hidden".

Replication steps:

1. Log in as a teacher/admin.
2. Navigate to a course containing a Feedback, Forum, Glossary or Survey module (or create one).
3. Hide the activity.
4. Go to the activity.
5. Click Administration > Switch role to... > Student

Expected result: The activity page should be shown as would be to a student, but not hidden.

Actual result: The activity states "Sorry, this activity is currently hidden".