Installing and upgrading help

This looks like CONTRIB-8551.

It looks like this is fixed in the version on GitHub so you could update to that version. Or you could just update the file mod/bigbluebuttonbn/classes/completion/custom_completion.php from GitHub. Or you could edit that file adding the following before the '}' on the last line:

    /** 
     * Returns an array of all completion rules, in the order they should be displayed to users. 
     * 
     * @return array 
     */ 
    public function get_sort_order(): array { 
        return [ 
            'completionengagementchats', 
            'completionengagementtalks', 
            'completionattendance', 
        ]; 
    }