After implementation of MDL-31487, we have lost the ability to show grades for hidden quizzes in the gradebook.

Previously we were able to hide the quiz on the course homepage, but still allow students to see the grade in the gradebook, if needed.

The steps that were working prior to 2.4.6 and 2.5.2

• Hide the Quiz on the course homepage
• Go to Quiz activity Settings.
• Locate "Review options" area.
• There are 4 possible states for 'Marks" (grades). If they are checked properly, then the Grade for the quiz will be shown to a student in the Gradebook. Even though the activity itself is hidden on the course homepage.

All other activities do allow such option (they can be hidden, but the grade can be made visible, if desired)

Related discussion: https://moodle.org/mod/forum/discuss.php?d=241474