[O] eval-line-and-step broken in org mode buffer

[SabreWolfy]

http://comments.gmane.org/gmane.emacs.ess.general/7239

I can confirm this with Org 7.8 and ESS 13.05 and R 3.0.1 under Ubuntu 12.04
LTS.

eval-line-and-step (F9) when in an Org file evaluates the line in R, and
then jumps the cursor elsewhere as described, instead of advancing it.
eval-line-and-step-invisibly advances the cursor to the next line, but does
not skip blank lines or comments.

Is this an ESS or Org issue?