[TYPO3-dev] missing output

[Roman Pretory]

Yes Is aggregate root is checkt in the ExtensionBuilder just load again to check.
css_style_content is used by default in my test t3 installation.
other extension build as plugin are working in this installation
in the meantime I have found this page http://blog.reelworx.at/detail/howto-register-your-plugin-ce-or-module/
so I make folowing changes:
Add Configuration/Overrides/tt_content.php
<?php

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
    'RPretory.' . $_EXTKEY,
    'Links',
    'LLL:EXT:Links/Resources/Private/Language/locallang.xlf:tx_othlinks_domain_model_links',
    'EXT:Links/Resources/Public/Icons/tx_othlinks_domain_model_links.gif'
);

change ext_localconf.php
<?php
if (!defined('TYPO3_MODE')) {
	die('Access denied.');
}

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
	'RPretory.' . $_EXTKEY,
	'Links',
	array(
		'Links' => 'index',
		
	),
	// non-cacheable actions
	array(
		'Links' => 'index',
		
	),
        \TYPO3\CMS\Extbase\Utility\ExtensionUtility::PLUGIN_TYPE_CONTENT_ELEMENT
);

no change no output :-(