[php-src] Issue #20813: = new without $value creates it twice. Hooked object.

Issue: https://github.com/php/php-src/issues/20813
Author: ACEx86

### Description

The following code:

```php
<?php
$B = new B;
$B->A = new A;
Class B
{
    Final Object $A{
        get => $this->A;
        set(Object $value) => new A;
    }
}

Class A
{
    public function __construct()
    {
        echo 'A'.PHP_EOL;
    }
}
```

Resulted in this output:
```
A
A
```

But I expected this output instead:
```
A
```

In the hooked variable set with = to new A instead of value will call it twice.
If object is not equal to calling value don't do actions.

### PHP Version

```plain
PHP 8.5.1 (cli) (built: Dec 16 2025 18:26:57) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.5.1, Copyright (c) Zend Technologies
    with Zend OPcache v8.5.1, Copyright (c), by Zend Technologies
```

### Operating System

_No response_