Using item_list in examples break rendering
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3529189. -->
Reported by: [malikah](https://www.drupal.org/user/3847191)
Related to !25
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>As for UI patterns (Issue <a href="https://www.drupal.org/project/ui_patterns/issues/3529153">#3529153</a>) since v1.0.2, we have error on example pages using <code>theme: item_list</code> </p>
<!--break--><p>
<strong>Error in the navigator : </strong></p>
<pre>Le site Web a rencontré une erreur inattendue.<br><br>Twig\Error\RuntimeError: An exception has been thrown during the rendering of a template (""type" is an invalid render array key. Value should be an array but got a string.") in "customer:layout" at line 11. in Twig\Template->yield() (line 11 of themes/custom/customer/components/layout/layout.twig).<br><br>template_preprocess_item_list()<br>call_user_func_array() (Line: 261)<br>Drupal\Core\Theme\ThemeManager->render() (Line: 491)<br>Drupal\Core\Render\Renderer->doRender() (Line: 504)<br>Drupal\Core\Render\Renderer->doRender() (Line: 248)<br>Drupal\Core\Render\Renderer->render() (Line: 484)<br>Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 77)<br>__TwigTemplate_ea68831567b6bbe1d179b4905979d5a4->doDisplay() (Line: 402)<br>Twig\Template->yield() (Line: 141)<br>__TwigTemplate_03c9ed99ec99034085d3fa3357192c92___2130353984->doDisplay() (Line: 402)<br>Twig\Template->yield() (Line: 44)<br>__TwigTemplate_03c9ed99ec99034085d3fa3357192c92->doDisplay() (Line: 402)<br>Twig\Template->yield() (Line: 358)<br>Twig\Template->display() (Line: 373)<br>Twig\Template->render() (Line: 51)<br>Twig\TemplateWrapper->render() (Line: 234)<br>Drupal\Core\Template\TwigEnvironment->renderInline() (Line: 54)<br>Drupal\Core\Render\Element\InlineTemplate::preRenderInlineTemplate()<br>call_user_func_array() (Line: 113)<br>Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 875)<br>Drupal\Core\Render\Renderer->doCallback() (Line: 432)<br>Drupal\Core\Render\Renderer->doRender() (Line: 504)<br>Drupal\Core\Render\Renderer->doRender() (Line: 504)<br>Drupal\Core\Render\Renderer->doRender() (Line: 248)<br>Drupal\Core\Render\Renderer->render() (Line: 238)<br>Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 638)<br>Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 231)<br>Drupal\Core\Render\MainContent\HtmlRenderer->prepare() (Line: 128)<br>Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90)<br>Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray()<br>call_user_func() (Line: 111)<br>Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 186)<br>Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)<br>Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)<br>Drupal\Core\StackMiddleware\Session->handle() (Line: 48)<br>Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)<br>Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)<br>Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 116)<br>Drupal\page_cache\StackMiddleware\PageCache->pass() (Line: 90)<br>Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)<br>Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)<br>Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)<br>Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)<br>Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)</pre><h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<ol>
<li>
Use <code>theme: item_list</code> in an example<br>
<strong>Example :</strong>
<pre>id: 'page-list-example'<br>category: list<br>enabled: true<br>label: 'List example'<br>render:<br> - theme: item_list<br> list_type: ul<br> items:<br> - type: html_tag<br> tag: p<br> value: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ...'<br> - type: html_tag<br> tag: p<br> value: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ...'<br> - type: html_tag<br> tag: p<br> value: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ...'<br> </pre></li>
<li>
Open your example page in navigator
</li>
</ol>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p><strong>This bug also concerns UI Patterns v2.0.4</strong></p>
<p>Our temporary solution is to prefix <code>items</code> content with <code>#</code></p>
<p><strong>For example :</strong></p>
<pre>- type: html_tag<br> tag: p<br> value: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ...'</pre><p><strong>became :</strong></p>
<pre>- '#type': html_tag<br> '#tag': p<br> '#value': 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ...'</pre><p>Is there a better solution ?</p>
<p>Thanks in advance for your help and feedback</p>
issue
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