TYPO3 Core

TCA from tx_styleguide_inline_fal inline_5:

        'inline_5' => [
            'label' => 'inline_5 appearance localization toggles',
            'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig(
                'inline_5',
                [
                    'appearance' => [
                        'showPossibleLocalizationRecords' => true,
                        'showRemovedLocalizationRecords' => true,
                        'showAllLocalizationLink' => true,
                        'showSynchronizationLink' => true,
                    ]
                ],
                $GLOBALS['TYPO3_CONF_VARS']['SYS']['mediafile_ext']
            ),
        ],

Then have a default language element with a child, have a translated element without child, then click "synchronize" button in the translated element. See image as result: The element is synchronized, but the "shadowed" row does not vanish.