Issue pre-registering variable for header

[Twilkey]

I have created a product and in that product everything works right. The only issue I am having is pre-registering a variable for my header template.

PHP Code:

include("./includes/class_twbr.php");

$defaultdir = str_replace(".", "", $vbulletin->options['twbr_default_dir']);
$rotaterid = 1;
$forumid = $foruminfo[forumid];
$show_banners = false;

if($forumid > 0) {
    $twbr = new TWBR($vbulletin);
    $twbr->twbr_set($defaultdir, $rotaterid, $forumid);
    $twbr->twbr_forum_query();
    $banner_query = $twbr->twbr_banner_query();
    
    $rotater_query = $twbr->twbr_rotater_query();
    $rotater = $vbulletin->db->fetch_array($rotater_query);
    $rotater_delay = 1000 * $rotater['delay'];
    $rotater_bits = array("id" => $rotater['id'], "title" => $rotater['title'], "width" => $rotater['width'], "height" => $rotater['height'], "bgcolor" => $rotater['bgcolor'], "delay" => $rotater_delay);
    
    $banner_bits = array();
    $banner_count = 0;
    while($banners = $vbulletin->db->fetch_array($banner_query)) {
        $banner_bits[$banner_count]["count"] = $banner_count;
        $banner_bits[$banner_count]["id"] = $banners["id"];
        $banner_bits[$banner_count]["name"] = $banners["name"];
        $banner_bits[$banner_count]["imageurl"] = $vbulletin->options['bburl'].urldecode($banners["imageurl"]);
        $banner_bits[$banner_count]["link"] = urldecode($banners["link"]);
        $banner_bits[$banner_count]["desc"] = $banners["desc"];
        $banner_count++;
        $show_banners = true;
    }
    
    $templater = vB_Template::create('twbr_bits');
    $templater->register('banner_bits', $banner_bits);
    $templater->register('rotater_bits', $rotater_bits);
    $twbr_bits = $templater->render();
    
    vB_Template::preRegister('header',array('twbr_bits' => $twbr_bits));
} 


Everything here works except the vB_Template:reRegister. The variable does get populated. I can see the data if I dump it.

I have tried many different plugin hook locations. I have tried the globals, the forumdisplays, I also tried parse_templates, but nothing seems to work, and it seems to just be with pre-registering for header, because I changed it to navbar and it worked, so I am a bit confused.