When on the /wp-admin/network/site-settings.php network settings page, calling the update_option() always add the setting

[zenithcity]

When on the network settings (/wp-admin/network/site-settings.php), the udpate_option() used to update the changed settings always adds the settings whenever the form is submitted. So instead of firing the "update_option" action hook after the settings are updated, it still fires the add_option action hook every time!

Obviously, this should give an error but because there's a bailer when adding option using ON DUPLICATE KEY UPDATE, no error is shown.