Steps to reproduce the issue

Everything was also done from a clean install (files and db).

1. Configure Xdebug to run with an IDE, here vscode. Start a debugging session.
   There, if you refresh the empty HOME page (from the frontend), nothing wrong happens.
2. Create an article, with whatever content you want, and set it to default.
3. Refresh the HOME page (from the frontend), and you get an unexpected Joomla\CMS\Categories\SectionNotFoundException exception.

Expected result

No exception, especially with the HOME page.

Actual result

For all pages in the frontend, I get this Joomla\CMS\Categories\SectionNotFoundException exception, even if this is not a "category page"…

The stack hit the following function before the exception in CategoryServiceTrait.php

	public function getCategory(array $options = [], $section = ''): CategoryInterface
	{
		return $this->categoryFactory->createCategory($options, $section);
	}

then the exception occurs in CategoryFactory.php :

	public function createCategory(array $options = [], string $section = ''): CategoryInterface
	{
		$className = trim($this->namespace, '\\') . '\\Site\\Service\\' . ucfirst($section) . 'Category';

		if (!class_exists($className))
		{
			throw new SectionNotFoundException;
		}

		return new $className($options);
	}

$className holds the following value:

• "Joomla\Component\Content\Site\Service\ArticleCategory"

System information (as much as possible)

Joomla 4 beta 3 from here :

• https://github.com/joomla/joomla-cms/releases

Additional comments

Tested with a clean install AND upgrade from beta3-dev.