Unexpected Updates in Model Relationships for v5.0.0RC3

[m-yamaishi09580]

Hi,

I'm looking to upgrade from Phalcon v3.4.5 and PHP7.3 to Phalcon v5 and PHP8.1.

I'm testing with Phalcon v5 RC3 and PHP 8.1.

I have

class Hardware
{
    public function initialize()
    {
        $this->hasOne("products_id", "Products", "id", ['alias' => 'products']);
    }
}

in the model initialize() method.

$hardware = \Hardware::findFirstById($id);

$hardware->products_id = null;

if (!$hardware->save()) {
    throw new \Exception('Hardware save failed.');
}

When I update products_id column to null with save(), id column is updated to null as well.

This did not happen in v3.4.5, why does it happen in v5 RC3?