As raised by dobedobedoh, gradebook tests are using manual steps to do things that could be done by data generators, for example the following steps:

• I give the grade "40.00" to the user "Student 1" for the grade item "Manual item 3"
• I hide the grade item "Test assignment name" of type "gradeitem" on "setup" page
• I set the following settings for grade item "Test assignment seven" of type "gradeitem" on "setup" page

Let's try to add the necessary generators and convert those steps to see if we can reduce the failures on builds running Selenium 4.