memcache.locking breaks ownNote functionality in OwnCloud 8.2.1

I just set up a completely new install of OwnCloud 8.2.1 and tried to satisfy all "Security & setup warnings". (Successfully.)
While digging down how to achive that, I added the line 'memcache.locking' => '\OC\Memcache\Redis', to my config.php

Later when I wanted to try OwnNote, the page loaded but remained completely blank. At the same time, the Android app would not connect due to an "internal server error" even though all certificates were allowed (mine is self-signed).
A look at the owncloud.log showed that the OwnNotes files were locked. (I think that's what Redis is supposed to do.)

After removing 'memcache.locking' => '\OC\Memcache\Redis', from the config.php everything worked flawless, but the setup warning returned (of course).

Is there a way to have both? OwnNote AND Memcache?
I really would like to benefit from memcache as "[Using memcache.locking relieves the database load and improves performance.](https://doc.owncloud.org/server/8.2/admin_manual/configuration_files/files_locking_transactional.html)".