Symfony version(s) affected: 4.4 - 6.0

Description
When we create new instance ErrorHandler with BufferingLogger and then attach logger via ErrorHandler ::setLoggers and BufferingLogger contains SilencedErrorContext - we are getting error Argument 1 passed to Symfony\Component\ErrorHandler\ThrowableUtils::getSeverity() must implement interface Throwable, instance of Symfony\Component\ErrorHandler\Exception\SilencedErrorContext given

How to reproduce
use Symfony\Component\ErrorHandler\ErrorHandler;
use Symfony\Component\ErrorHandler\BufferingLogger;
use Psr\Log\LoggerInterface;

$handler = new ErrorHandler(new BufferingLogger(), false);
ErrorHandler::register($handler);

@file ('non_existent_file');

$handler->setDefaultLogger(new LoggerInterface);

Possible Solution
class SilencedErrorContext extends \ErrorException

Additional context
Argument 1 passed to Symfony\Component\ErrorHandler\ThrowableUtils::getSeverity() must implement interface Throwable, instance of Symfony\Component\ErrorHandler\Exception\SilencedErrorContext given