Undefined array key "host" in src/XF/CacheFactory.php

Upgraded from 2.2.15 to the 2.3 beta 1 on a test server from the command line and get this error.
PHP 8.2.15

An exception occurred: [ErrorException] [E_WARNING] Undefined array key "host" in src/XF/CacheFactory.php on line 192
#0 src/XF/CacheFactory.php(192): XF::handlePhpError(2, '[E_WARNING] Und...', '/home/nginx/dom...', 192)
#1 src/XF/CacheFactory.php(116): XF\CacheFactory->createMemcachedCache(Array)
#2 src/XF/CacheFactory.php(44): XF\CacheFactory->instantiate('Memcached', Array)
#3 src/XF/App.php(725)...

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