Session data lost on redirect

Hi,
I'm struggling to to properly redirect from a filter. I'm trying to store some data in the SESSION before returning from the filter with the idea to use the data in the page redirected to.

Everything works fine when I use secure connection (https). Without a secure connection the data written to teh SESSION is gone when I try to read it on the redirection target page. These are my coockie and session settings:

PHP Code:

    public $sessionDriver            = 'CodeIgniter\Session\Handlers\FileHandler';
    public $sessionCookieName        = 'ci_session';
    public $sessionExpiration        = 7200;
    public $sessionSavePath          = WRITEPATH . 'session';
    public $sessionMatchIP           = false;
    public $sessionTimeToUpdate      = 300;
    public $sessionRegenerateDestroy = false;
    public $cookiePrefix   = 'nexus_';
    public $cookieDomain   = '';
    public $cookiePath     = '/';
    public $cookieSecure   = false;
    public $cookieHTTPOnly = false; 


Any help is much appreciated.