Bug report

Optional keys on objects can be coalesced, but in PHPStan they result in the error type.

This works:

class Test {}

$a = new \stdClass();
$b = new Test();

var_dump($a->optional ?? null, $b->optional ?? null);

Accessing $b->optional without coalesce results in Warning: Undefined property.

Code snippet that reproduces the problem

https://phpstan.org/r/1f24e6ab-289c-45ad-861c-1f7455f55723

Expected output

Both types should be int|null

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