phpstan: false positive on loop with several types for the same variable

Among other things

  226    Cannot call method hasChild() on false.                                  
  227    Cannot call method getChild() on false. 

is returned for this piece of code:

public function getAdminByAdminCode($adminCode)
{
    $codes = explode('|', $adminCode);
    $admin = false;
    foreach ($codes as $code) {
        if ($admin == false) {
            $admin = $this->getInstance($code);
        } elseif ($admin->hasChild($code)) {
            $admin = $admin->getChild($code);
        }
    }
    return $admin;
}

The false case is already handled.