Neos\Neos\Controller\Backend\ContentController::initializeCreateImageVariantAction PHP Метод

    public function initializeCreateImageVariantAction()
    {
        $this->arguments->getArgument('asset')->getPropertyMappingConfiguration()->allowOverrideTargetType()->allowAllProperties()->setTypeConverterOption(PersistentObjectConverter::class, PersistentObjectConverter::CONFIGURATION_CREATION_ALLOWED, true);
    }