Bug in update routine 3.2.0-RC1 - wrong tmp path

I´ve tried to update 3.1.8 to 3.2.0RC1. I run into an error:

[phpBB debug] "realpath() [function.realpath]: open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/users/ladyscommunity/www:/users/_temp/ladyscommunity)" in file /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/FileLocator/FileLocator.php on line 43
Warning: realpath() [function.realpath]: open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/users/ladyscommunity/www:/users/_temp/ladyscommunity) in /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/FileLocator/FileLocator.php on line 43

Fatal error: Uncaught exception 'ProxyManager\Exception\InvalidProxyDirectoryException' with message 'Provided directory "/tmp" does not exist' in /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/Exception/InvalidProxyDirectoryException.php:38 Stack trace: #0 /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/FileLocator/FileLocator.php(46): ProxyManager\Exception\InvalidProxyDirectoryException::proxyDirectoryNotFound('/tmp') #1 /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/Configuration.php(119): ProxyManager\FileLocator\FileLocator->__construct('/tmp') #2 /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/Factory/AbstractBaseFactory.php(110): ProxyManager\Configuration->getProxyAutoloader() #3 /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/Factory/AbstractBaseFactory.php(76): ProxyManager\Factory\AbstractBaseFactory->generateProxyClass('ProxyManagerGen...', 'phpbb\template\...', Array) #4 /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/Factory/AbstractLazyFactory.php(42): ProxyManager\Factory\AbstractBaseFactory->generateProxy('phpbb\template\...') #5 /users/ladyscommunity/www/320/bbupd/vendor/symfony/proxy-manager-bridge/LazyProxy/Instantiator/RuntimeInstantiator.php(56): ProxyManager\Factory\AbstractLazyFactory->createProxy('phpbb\template\...', Object(Closure)) #6 /users/ladyscommunity/www/320/bbupd/vendor/symfony/dependency-injection/ContainerBuilder.php(884): Symfony\Bridge\ProxyManager\LazyProxy\Instantiator\RuntimeInstantiator->instantiateProxy(Object(Symfony\Component\DependencyInjection\ContainerBuilder), Object(Symfony\Component\DependencyInjection\Definition), 'template.twig.l...', Object(Closure)) #7 /users/ladyscommunity/www/320/bbupd/vendor/symfony/dependency-injection/ContainerBuilder.php(475): Symfony\Component\DependencyInjection\ContainerBuilder->createService(Object(Symfony\Component\DependencyInjection in /users/ladyscommunity/www/320/bbupd/vendor/ocramius/proxy-manager/src/ProxyManager/Exception/InvalidProxyDirectoryException.php on line 38

phpinfo:

open_basedir
/users/ladyscommunity/www:/users/_temp/ladyscommunity

upload_tmp_dir
/users/_temp/ladyscommunity

see thread on phpbb.com