By the 'latest version', I'm assuming that you mean v2.3.0 (and I'm not able to replicate your issue). The highlighted line below is line 355 of that release's version of that file:
Code:
// -----
// Determine if there are any payment modules that are in the confirmation-required list.
//
// The generated list is used within the /includes/modules/pages/checkout_one/jscript_main.php module to determine what text to
// display for the order-submittal text/title.
//
$required_list = '';
if (!empty(CHECKOUT_ONE_CONFIRMATION_REQUIRED)) {
    $confirmation_required = explode(',', CHECKOUT_ONE_CONFIRMATION_REQUIRED);
    $required_list = '"' . implode('", "', $confirmation_required) . '"';
}