php pdo query() throws error AND exception when mysql server has gone away

Output.txt

PHP Warning:  PDO::query(): MySQL server has gone away in C:\Users\Juris\Desktop\test\test.php on line 23

Warning: PDO::query(): MySQL server has gone away in C:\Users\Juris\Desktop\test\test.php on line 23
PHP Warning:  PDO::query(): Error reading result set's header in C:\Users\Juris\Desktop\test\test.php on line
23

Warning: PDO::query(): Error reading result set's header in C:\Users\Juris\Desktop\test\test.php on line 23
Exception: connection problem. Message: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away

test.php

<?php
try
{
	$connection = new PDO(
		'mysql:dbname=test;host=localhost;port=3306;',
		'username',
		'password',
		[
			PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
		]
	);
}
catch (PDOException $e)
{
	echo 'Failed to initialize database connection. Message: ', $e->getMessage(), PHP_EOL;
	die();
}

try
{
	$connection->exec('SET SESSION wait_timeout = 1'); // make the connection close after 1 second, for test purposes
	sleep(3); // wait for the connection to die
	$sum = $connection->query('SELECT 1 + 1')->fetchColumn(0); // query() should throw an exception, because ERRMODE is set to EXCEPTION
	
	if (intval($sum) === 2)
	{
		echo 'connection is good', PHP_EOL;
	}
	else
	{
		echo 'connection problem', PHP_EOL;
	}
}
catch (PDOException $e)
{
	echo 'Exception: connection problem. Message: ', $e->getMessage(), PHP_EOL;
}