PHP wrong context execution

<?php

class Base
{
    public function testBase()
    {
        var_dump(__METHOD__ . ' is ran from: ' . get_class($this));

        return $this->x;
    }
}

class Aclass extends Base
{
    private $x = __CLASS__;

    public function test()
    {
        var_dump(__METHOD__ . ' is ran as: ' . get_class($this));

        return $this->x;
    }
}

class Bclass
    extends Aclass
{
    private $x = __CLASS__;
}


$bObj = new Bclass();
var_dump($bObj, $bObj->test());

echo '===========' . PHP_EOL;

\Closure::bind(function() { return $this->test(); }, new Aclass(), $bObj)->__invoke();
//force a context change
\Closure::bind(function() { return $this->test(); }, $bObj, $bObj)->__invoke();

echo '===========' . PHP_EOL;

$aObj = new Aclass();
$aObj->testBase();