Description:
------------
This Bugs happens in Version 7.4.13 and 8.0.0.

You also need to Create a Table like:
CREATE TABLE tabba (id int AUTO_INCREMENT, name varchat(32) NOT NULL);

And insert something in it:
INSERT INTO tabba (name) VALUES ("Franc");

It is possible to remove the Error an go back to expected behavior when removing "PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION".
But is more or less only a workaround.

This Bug break functions like Query which creates an PDO Statement and returns an array of the fetchAll result.

Test script:
---------------
<?php

error_reporting(E_ALL);
ini_set('display_errors', 1);

$_Host = '127.0.0.1';
$_Port = 3306;
$_Database = 'test';
$_Charset = 'utf8mb4';
$_DriverOptions =
    [
        PDO::ATTR_EMULATE_PREPARES => false,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
    ];

$iDSN = 'mysql:dbname=' . $_Database . ';host=' . $_Host . ';port=' . $_Port . ';charset=' . $_Charset;
var_dump($iDSN);
$_Hash = hash('sha512', $iDSN);

try {
    $_ObjDb = new PDO($iDSN, 'dbuser', 'dbpassword', $_DriverOptions);
} catch (Exception $e) {
    var_dump($e);
    exit('Connection to database failed.');
}

$iStatement = $_ObjDb->prepare('UPDATE tabba SET name=:name WHERE id = 1');
$iName = 'Frank';
$iStatement->bindParam(':name', $iName);


try {
    var_dump($iStatement->execute());
}
catch(PDOException $e) {
    die($e->getMessage());
}

var_dump($iStatement->rowCount());
if ($iStatement->rowCount() > 0) {
    var_dump($iStatement->fetchAll());
}


Expected result:
----------------
In version 7.4.12 and older fetchAll() would return an empty array.

Actual result:
--------------
Returns an Error that something is unbuffered.