Categories inside repeaters not working

Categories stop working when inside a repeater.

This works:

<div class="chartWrap">
    <div class="chartItem verlag"><perch:content id="item" type="text" label="Name" required="true" /></div>
    <div class="chartBar"><span><span style="width:<perch:content id="percent" type="text" label="Percent Full" help="Please enter a number 0-100" required="true" />%; background-color:<perch:categories id="categories" set="pipeline" display-as="checkboxes" label="Category" help="Please choose only one category"><perch:category type="color" id="color" /></perch:categories>;"></span></span></div>
</div>

This doesn't work:

<perch:repeater id="idontwork" Label="Content">
    <div class="chartWrap">
        <div class="chartItem verlag"><perch:content id="item" type="text" label="Name" required="true" /></div>
        <div class="chartBar"><span><span style="width:<perch:content id="percent" type="text" label="Percent Full" help="Please enter a number 0-100" required="true" />%; background-color:<perch:categories id="categories" set="pipeline" display-as="checkboxes" label="Category" help="Please choose only one category"><perch:category type="color" id="color" /></perch:categories>;"></span></span></div>
    </div>
</perch:repeater>

It does work with blocks though:

<perch:blocks>
  <perch:block type="quote" label="Chart Item">
    <div class="chartWrap">
        <div class="chartItem verlag"><perch:content id="item" type="text" label="Name" required="true" /></div>
        <div class="chartBar"><span><span style="width:<perch:content id="percent" type="text" label="Percent Full" help="Please enter a number 0-100" required="true" />%; background-color:<perch:categories id="categories" set="pipeline" display-as="checkboxes" label="Category" help="Please choose only one category"><perch:category type="color" id="color" /></perch:categories>;"></span></span></div>
    </div>
  </perch:block>
</perch:blocks>

Diagnostics:

Perch: 2.8.7, PHP: 5.5.11, MySQL: mysqlnd 5.0.11-dev - 20120503 - $Id: bf9ad53b11c9a57efdb1057292d73b928b8c5c77 $, with PDO
Server OS: WINNT, apache2handler
Installed apps: content (2.8.7), assets (2.8.7), categories (2.8.7)
App runtimes: <?php $apps_list = array( 'content', 'categories', );
PERCH_LOGINPATH: (removed)
PERCH_PATH: (removed)
PERCH_CORE: (removed)
PERCH_RESFILEPATH: (removed)
Image manipulation: GD
PHP limits: Max upload 1000M, Max POST 1000M, Memory: 500M, Total max file upload: 500M
Resource folder writeable: Yes
HTTP_HOST: (removed)
DOCUMENT_ROOT: (removed)
REQUEST_URI: (removed)
SCRIPT_NAME: (removed)