Setup (before MDL-78322 ) Using current master/stable branch (e.g. that prior to the one being tested in this issue) Install site Log in as admin Create three new users User 1 User 2 User 3 Create cohort Add yourself to the new cohort Navigate to Users > Permissions > Define roles from site administration Edit the Manager role Select User from Context types where this role may be assigned and save changes Navigate to Users > Permissions > Assign user roles in context in site administration Select users 1-3 in Select users to assign role Select role: Manager Select cohorts: new cohort Press Assign Navigate to Users > Accounts > Browse list of users Delete User 1 Test MDL-78322 Check out branch Run upgrade step Navigate to Users > Permissions > Assign user roles in context in site administration Confirm Existing cohort role assignments table no longer shows User 1 Navigate to Users > Accounts > Browse list of users Delete User 2 Navigate to Users > Permissions > Assign user roles in context in site administration Confirm Existing cohort role assignments table no longer shows User 2 Navigate to Server > Tasks > Scheduled tasks in site administration Execute the Sync cohort role assignments task (press Run now ) Confirm task executes successfully Navigate to Preferences from user menu Press Roles > Assign roles relative to this user Confirm User 3 has the Manager role