Categories template tag in perch:before tag

Hi,

I've created a category set and called it 'Projects'. I've then created a multi region content item, also called projects and in the template, I've used something like the below:

<perch:before>
<div class="filter-bar mt40">
    <perch:categories id="ProjectCategory" set="projects">
        <perch:before>
            <ul>
        </perch:before>
                <li>
                    <a href="?category=<perch:category id="catSlug" />"><perch:category id="catTitle" /></a>
                </li>
        <perch:after>
            </ul>
        </perch:after>
    </perch:categories>
</div>
<div class="latest-projects mb40">
</perch:before>
    <a href="/project/<perch:content id="slug" type="slug" for="Title" />" class="latest-project">
        <div class="latest-project--details">
            <h2><perch:content id="Title" type="text" label="Title" /></h2>
            <span class="lastest-project--subtitle"><perch:content id="SubTitle" type="text" label="Subtitle" /></span>
            <span class="latest-project--view" href="#">View poject</span>
        </div>
        <img class="latest-project--image" src="<perch:content id="MainImage" type="image" width="640" height="400" crop="true" />" alt="<perch:content id="Title" type="text" label="Title" />">
    </a>
<perch:after>
</div>
</perch:after>

So, I'd like to output the categories from that set in the <perch:before> tag of that template, but it's not working as expected. If I use it in perch before, it will only output the categories applied to the first item in the multi region content item. If I move the categories tag to the <perch:after> tag, it'll display the cats that are applied to the last item. It doesn't output all the categories in the set.

Diagnostic below:

Perch: 2.8.8, PHP: 5.5.1, MySQL: mysqlnd 5.0.11-dev - 20120503 - $Id: 40933630edef551dfaca71298a83fad8d03d62d4 $, with PDO
Server OS: WINNT, apache2handler
Installed apps: content (2.8.8), assets (2.8.8), categories (2.8.8)
App runtimes: <?php $apps_list = array( 'content', 'categories', );
PERCH_LOGINPATH: /perch
PERCH_PATH: E:\Vital\Local Projects\Evolve\trunk\Evolve\perch
PERCH_CORE: E:\Vital\Local Projects\Evolve\trunk\Evolve\perch\core
PERCH_RESFILEPATH: E:\Vital\Local Projects\Evolve\trunk\Evolve\perch\resources
Image manipulation: GD
PHP limits: Max upload 2M, Max POST 8M, Memory: 128M, Total max file upload: 2M
Resource folder writeable: Yes
HTTP_HOST: evolve.dev:81
DOCUMENT_ROOT: E:/Vital/Local Projects/Evolve/trunk/Evolve
REQUEST_URI: /perch/core/settings/diagnostics/
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php

For now, I'm simply using the below code to output the projects:

perch_content_custom('Projects', array(
                'page'      => '/project.php',
                'template'  => 'projects.html'
            ));