function wpf_disable_login_tags_on_registration( $post_data, $user_id, $price, $payment_id ) {

    remove_action( 'wp_login', array( wp_fusion_logins()->public, 'user_login' ), 10, 2 );

}

add_action( 'rcp_form_processing', 'wpf_disable_login_tags_on_registration', 10, 4 );