TYPO3 Core

I've just tried the newly released TYPO3 v10 and stumbled upon an exception.

When you register a Slot for the Signal tcaIsBeingBuilt in your ext_localconf, you will get a LogicException in TYPO3 v10.0.0:

$signalSlotDispatcher->connect(\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::class, 'tcaIsBeingBuilt', \Example\ExampleExtension\TCA::class, 'addTCA');

The Exception is:

(1/1) #1549446998 LogicException
TYPO3\CMS\Core\Cache\CacheManager can not be injected/instantiated during ext_localconf.php loading. Use lazy loading instead.

This apparently happens when the signal is dispatched via Extbase. An ObjectManager is created which would get a CacheManager:
Dispatcher.php#L126