TYPO3 Core

TYPO3 9 contains two sections in LocalConfiguration.php with extension settings:

    'EXT' => [
        'extConf' => [
            'aimeos' => 'a:8:{s:8:"siteCode";s:7:"default";s:7:"cleanDb";s:1:"1";s:11:"useDemoData";s:0:"";s:20:"useRealUrlAutoConfig";s:1:"1";s:9:"cacheName";s:5:"Typo3";s:6:"useAPC";s:1:"0";s:9:"apcPrefix";s:3:"t3:";s:12:"showPageTree";s:1:"0";}',
        ]
    ]

    'EXTENSIONS' => [
        'aimeos' => [
            'apcPrefix' => 't3:',
            'cacheName' => 'Typo3',
            'cleanDb' => '1',
            'showPageTree' => '0',
            'siteCode' => 'default',
            'useAPC' => '0',
            'useDemoData' => '',
            'useRealUrlAutoConfig' => '1',
        ],
    ]

Using the new ExtensionConfiguration class updates the EXT/extConf section but not the new EXTENSIONS section:

$object = $objectManager->get( 'TYPO3\CMS\Core\Configuration\ExtensionConfiguration' );
$object->set( 'aimeos', 'useDemoData', '' );

Thus, the new "Settings -> Extension Configuration" panel shows the settings from EXTENSIONS which haven't been updated, so users see wrong values.