Prevents a cancellation email from being set if the user was assigned a new membership level during the cancellation process.

my_pmpro_disable_incorrect_cancellation_emails.php

<?php

// Copy from below here

/*
 * Prevents a cancellation email from being set if the user
 * was assigned a new membership level during the cancellation
 * process.
 */
function my_pmpro_disable_incorrect_cancellation_emails($recipient, $email)
{
	if ( strpos($email->template, "cancel") !== false ) {
		$user = get_user_by( 'login', $email->data['user_login'] );
		if ( pmpro_hasMembershipLevel( null, $user->ID  ) ) {
  			$recipient = NULL;
		}
	}
	return $recipient;
}
add_filter("pmpro_email_recipient", "my_pmpro_disable_incorrect_cancellation_emails", 10, 2);