TYPO3 Core

Since the update from TYPO3 12.4.9 to 12.4.10. the function addTcaSelectItemGroup does not register the select item group correcty. When a plugin is registered, it overrides the configured tca select item group and provokes a PHP warning Core: Error handler (BE): PHP Warning: Array to string conversion in /var/www/html/vendor/typo3/cms-core/Classes/Localization/LanguageService.php line 178.

To reproduce - add TCA Select Item Group:

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTcaSelectItemGroup(
    'tt_content',
    'list_type',
    'dummy',
    'Dummy'
);

=> Group is added to TCA configuration correctly

Register a plugin in that group:

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
    'Dummy',
    'Dummy',
    'Dummy',
    '',
    'dummy'
);

=> Group is overwritten by an array, therefore the label is not displayed

The attachment is a small dummy extension which demonstrates the problem and the screenshot shows the active TCA configuration with the label missing. The dropdown-field itself shows 'Array' as label or throws an exception (based on error handling configuration).