Neos\Neos\Controller\Service\WorkspacesController::initializeUpdateAction PHP Method

    public function initializeUpdateAction()
    {
        $propertyMappingConfiguration = $this->arguments->getArgument('workspace')->getPropertyMappingConfiguration();
        $propertyMappingConfiguration->allowProperties('name', 'baseWorkspace');
        $propertyMappingConfiguration->setTypeConverterOption(PersistentObjectConverter::class, PersistentObjectConverter::CONFIGURATION_MODIFICATION_ALLOWED, true);
    }