extended background on org-block-end-line

[Al Haji-Ali]

I'll admit this "bug" is not critical, but it is visually annoying (at least to 
me).
When hiding an org entry, source blocks with extended backgrounds remain 
visible.

To re-produce:

0. Run `emacs -Q`

1. Create a buffer with this content and ensure `org-mode` is on
------------------------------------------------------------
* One
#+begin_src emacs-lisp
#+end_src
* Two
#+begin_src emacs-lisp
#+end_src
------------------------------------------------------------

2. Change the face `org-block-end-line` to have an extended background on the 
end-line of the
org-block

(set-face-attribute
   'org-block-end-line nil
   :extend t
   :background "#4e5079")

4. Go to "One" and press tab

5. Notice how the background colour now appears next to "One".

Is there a way to fix this? Note that if the org-block is not the last line in 
the entry (for example if there's an empty line before "* Two") then the visual 
artefact is not present.  

-- Al