Unexpted changing of public properties in class Screen

it seems that value of ALL public properties of Screen is changed after query() call.
Even if this property is not changed in query()
Compare values in query() and Save

class MyScreen extends Screen
{
    protected $protected_property = 'Some protected value';
    public  $public_property  = 'Some public value';

    public function query($id = null): iterable
    {
        echo $this->protected_property; // 'Some protected value'
        echo $this->public_property;  // 'Some public value'
        return [];
    }

    public function layout(): iterable
    {
        return [Layout::rows([
            Button::make('Кнопка')->method('Save')
        ])];
    }

    public function Save()
    {
        echo $this->protected_property; // 'Some protected value'
        echo $this->public_property;  // null. WTF?!
    }