Description:
------------
When I define multiple properties within a single statement and a native typehint, ReflectionType reports wrong allowsNull():

private ?DateTimeImmutable $startDate, $endDate;

Reproduction: https://3v4l.org/hITTk

Related PHPStan issue: https://github.com/phpstan/phpstan/issues/2886

Test script:
---------------
<?php
declare(strict_types=1);

final class CreateStatementRequest
{
    private ?DateTimeImmutable $startDate, $endDate;
}

$ref = new \ReflectionClass(CreateStatementRequest::class);
foreach ($ref->getProperties() as $refProperty) {
    var_dump($refProperty->getName());
    $refType = $refProperty->getType();
    var_dump($refType->getName());
    var_dump($refType->allowsNull());
    
    var_dump('---');
}

Expected result:
----------------
string(9) "startDate"
string(17) "DateTimeImmutable"
bool(true)
string(3) "---"
string(7) "endDate"
string(17) "DateTimeImmutable"
bool(true)
string(3) "---"

Actual result:
--------------
string(9) "startDate"
string(17) "DateTimeImmutable"
bool(true)
string(3) "---"
string(7) "endDate"
string(17) "DateTimeImmutable"
bool(false)
string(3) "---"