cookie cannot be set

Have WP_DEBUG enabled. Since the last update (4.3.1), I’m getting the debug.log steadily filled with these:

PHP Notice: wp_woocommerce_session_e03d1d1db669f41e7a75325c178ba160 cookie cannot be set - headers already sent by on line 0 in /wp-content/plugins/woocommerce/includes/wc-core-functions.php on line 1039

After some debugging, the premature headers seem to originate from /wp-cron.php.

The fix that’s working for me is in woocommerce\includes\wc-core-functions.php line 1036 to add a check for when DOING_CRON (and think perhaps for DOING_AJAX, too):

function wc_setcookie( $name, $value, $expire = 0, $secure = false, $httponly = false ) {
	if ( ! headers_sent() ) {
		setcookie( $name, $value, $expire, COOKIEPATH ? COOKIEPATH : '/', COOKIE_DOMAIN, $secure, apply_filters( 'woocommerce_cookie_httponly', $httponly, $name, $value, $expire, $secure ) );
#-->
  //} elseif ( Constants::is_true( 'WP_DEBUG' ) ) {
    } elseif ( Constants::is_true( 'WP_DEBUG' ) && ! defined( 'DOING_CRON' ) && ! defined( 'DOING_AJAX' ) ) { 
#<--
		headers_sent( $file, $line );
		trigger_error( "{$name} cookie cannot be set - headers already sent by {$file} on line {$line}", E_USER_NOTICE ); // @codingStandardsIgnoreLine
}