As noticed on the site Mount Orange University, after upgrading to 5.0, all quizzes are listed on the course question banks page under 'Other activities with questions' e.g. Celebrating Cultures > Question banks.

Expected result: Other activities with questions have questions which can't be shared, so questions should be saved in the quiz activity question bank and not the course shared question bank.

Actual result: All quiz questions are saved in the course shared question bank e.g. Quiz: Know your Geography! > Questions.