Hi Oleksandr,
[...]
>
> 2. Edit the following minimal example:
>
> #+begin_src
> (defun id (x) x)
> #+end_src
>
The behavior you describe below is the desired behavior, not a bug. A
language is a desired property of a code block, if you want a simple
example block please use the example syntax.
Remember to cover the basics, that is, what you expected to happen and
what in fact did happen. You don't know how to make a good report? See
http://orgmode.org/manual/Feedback.html#Feedback
Your bug report will be posted to the Org-mode mailing list.
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