Missing fields are replaced with null

[nepster-web]

Q	A
Bug report?	yes
Feature request?	no
BC Break report?	no
RFC?	no

So I used version 3.18 in the symfony ecosystem from https://github.com/schmittjoh/JMSSerializerBundle and everything worked for me:

Suppose there is a certain entity:

class User
{
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column(type: 'integer', options: ['unsigned' => true])]
    #[JMS\Groups(['List', 'Show'])]
    private ?int $id = null;

    #[ORM\Column(type: 'string', length: 45, nullable: true)]
    #[JMS\SerializedName('clientIp')]
    #[JMS\Groups(['List', 'Create', 'Show'])]
    #[Assert\Length(min: 7, max: 45)]
    private ?string $clientIp = null;
...

and next code:

$json = json_encode(['clientIp' => '127.0.0.1']);
$user = // User (from db with data {id: 1, clientIp: '127.0.0.1'})
$updatedUser= $this->getJMSSerializer()->deserialize($json, $user, 'json', $context);

$updatedUser = User {id: 1, clientIp: '127.0.0.1'}

everything is fine then I did a large-scale system update and my current version 3.28.

and the same code works differently for my $updatedUser is:

$updatedUser = User {id: null, clientIp: '127.0.0.1'}

Previously, if $json did not have some keys, they were simply skipped, but now they are replaced with null.

Is this a bug in this version or did I miss something during the update?

Expected Result

$updatedUser = User {id: 1, clientIp: '127.0.0.1'}

Actual Result

$updatedUser = User {id: null, clientIp: '127.0.0.1'}

[nepster-web]

seems like a false alarm. this is due to the user logic of operation object constructor