Hi!!
Confirmed 2.3.2, it's the same problem...
Why magento don't give an answere and if memcached is obsoleted please write in the devdocs... i'm wasting time for this mistake...
L
This is a bug
https://github.com/magento/magento2/issues/24717
magento did NOT drop memcache support, that information is false
Setting session handling to memcached in php.ini resolved the issue
session.save_handler = memcached