Description:
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After update my Centos 7 server to PHP lsphp74-pdo 7.4.13-1.el7 i get many PDO errors like: 
Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute. in /var/www/xxxx.php:901 Stack trace: #0 /var/www/xxxx.php(901): PDOStatement->fetch() #1 {main} thrown in /var/www/xxxx.php on line 901 

Code is working fine with lsphp73-pdo 7.3.25-1.el8 (and lower) and lsphp74-pdo 7.4.11-1.el7
Have checked the code but no improvement. 

Test script:
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include ("../pdoconnect.php");

$user = "user";
$passwd = "password";
$stmt = $pdo->prepare("SELECT timestamp, UNIX_TIMESTAMP(),id, name FROM firsttable WHERE user = :user AND password = :password ");
$stmt->execute(array(':user' => $user, ':password' => $passwd));  
$db_erg = $stmt->fetch();


$time = "2020-01-01 00:00:00";
$dump = "test0123";
$sqlstring = "TEST";

$stmt = $pdo->prepare("UPDATE secondtable SET sqlstring= :sqlstring, dump= :dump WHERE time = :time ");
$stmt->execute(array(':sqlstring' => $sqlstring, ':dump' => $dump, ':time' => $time ));  
$stmt->fetch();