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Re:MySQL 8.0: Retiring Support for the Query Cache by tyingq on Tuesday May 30, 2017 @02:34PM (#14447372)
The object cache doesn't persist across HTTP requests. You have to install some 3rd party plugin for that.[1]

[1]https://codex.wordpress.org/Class_Reference/WP_Object_Cache

Re:MySQL 8.0: Retiring Support for the Query Cache by Viper007Bond on Tuesday May 30, 2017 @02:37PM (#14447398)
Correct, which is what I meant by enabling it. Apologies for not being clearer.

It used to persistent via writing objects to the filesystem but it actually ended up being _slower_ in some configurations.