Interceptor not working when calling parent::method()

[milansimek]

Preconditions

Magento 2.1.7 + PHP 7.0.22

Steps to reproduce

1. Create the following structure:

class A {
  public function doSomething(){
     echo 'I do something! (original)';
  }
}

class B extends class A {
  public function parentDoSomething(){
     parent::doSomething();  
  }
}

2. Now create an around plugin for the class A doSomething method:

public function aroundDoSomething(\Namespace\A $subject, callable $proceed){
        echo 'I do something else! (plugin)';
}

3. Now execute $classB->parentDoSomething();

Expected result

I do something else! (plugin) should be printed

Actual result

I do something! (original) is printed

Other information

Calling $this->doSomething() in class B does produce the correct result.

[magento-engcom-team]

@milansimek, thank you for your report.
We've created internal ticket(s) MAGETWO-83669 to track progress on the issue.