Is it a bug that a parent class that access its own private members from derived classes gets deprecation warning?

[bauss]

On Saturday, 7 April 2018 at 20:14:49 UTC, bauss wrote:
>         foreach (child; values)
>         {
>           child._isChild = true;
>         }

I forgot: _isChild should be _baz in the narrowed down version.