WordPress auto updating plugins even when autoupdate is turned off

For a while now WordPress has been auto updating all the plugins as a new update becomes available. It appears to be doing it every 12 hours. I checked the wp_cron events using plugin WP Crontrol and found the wp_cron event wp_update_plugins runs every 12 hours and the next run corresponds to the times that the wordpress.com console says my wordpress site auto updated a plugin. I added the filter command “add_filter( ‘auto_update_plugin’, ‘__return_false’ );” in my themes functions.php file to no avail. I do have the latest jetpack plugin installed and I have set its wordpress plugin auto update function switches for each plugin to disabled as well to no avail.

What else could it be?

Ted