Mysql bug in Direct Mode

I’ve been tuning mysql recently using mysqltuner.

After enabling the plugin today in Direct Mode at first, mysqltuner gave a warning I’ve never seen before:

Your applications are not closing MySQL connections properly

Once I switched to PHP Mode and restarted mysql and surfed my site on various types of pages, the warning no longer appears.

https://www.ads-software.com/plugins/super-static-cache/