[Templates] 2.15 breaks session variables

[snacktime]

After upgrading from 2.14 to 2.15,  session variables cannot be
updated.  The sessions are stored with Apache::Session.  Changing the
backend session store makes no difference.  Following are some code
snippets that show how I pass the session vars to template toolkit.
Downgrading to 2.14 fixed the  problem.  2.15 was installed on freebsd
via the ports collection.


$vars = {
      session => \%{$req->{session}},
      params => \%{$req->{params}},
};

$AdminGW110::template->process($req->{req_file}, $vars, $r);