Would you mind sending a PR please?

I want to clarify how this bug differs from #35454

Originally, there was an object

class Foo
{
     /**
     * @Assert\NotBlank()
     */
    public int $bar;
}

If a property is accessed in this initial uninitialized state, PHP throws an error:

Typed property Foo::$bar must not be accessed before initialization

Thus, when the validator tried to check the value and called ReflectionProperty::getValue() an error was triggered. #35532 fixed it.

But that fix broke one special case. If there is an object

class Foo
{
     /**
     * @Assert\NotBlank()
     */
    public int $bar;
    
    public function __construct()
    {
        unset($this->bar);
    }
    
    public function __get($name)
    {
        return 42;
    }
}

And a property is accessed in that unsetted but with __get method state, no error is triggered. Magic method will be called and 42 will be returned.

This issue is about that.

But there is one special case related with PHP 7.4.0 and 7.4.1+.

class Foo
{
     /**
     * @Assert\NotBlank()
     */
    public int $bar;
        
    public function __get($name)
    {
        return 42;
    }
}

This code will trigger error in 7.4.1+, but not in 7.4.0 (42 will be returned).

Therefore, a full implementation should only consider the latest version of PHP. There is no reason to implement a behavior that was found to be erroneous and fixed in future versions.

Recap
An unfixed validator implementation will fail with the second - unsetted with __get method - properties, considering them null.