on integrations/facebook.php line 88, the session key to store needs to be FBRLH_state not FBLOGIN_state.

This is found in facebooks \Facebook\PersistentData\FacebookSessionPersistentDataHandler class. This becomes a problem when using https://www.ads-software.com/plugins/wp-native-php-sessions/.

Ideally, $_SESSION could be avoided entirely as it can cause issues and WP does not rely on iot at all.

Thanks.