Parent command with count other than 1 not working

Using the p command with a count of 2 lands on a line that is not the second parent.

    normal      p       Jumps the cursor to the commit which is the parent of
                        current line.  When on a merge commit, a |count|
                        may be used to choose a parent other than the first.

Here's a visualization:

*    [36e496edd] Merge commit  <-- Selected commit
|\                             <-- Actual destination after `2p`
| *  [840c62324] Second Parent <-- Desired destination after `2p`
*    [01008770c] First parent  <-- Actual destination after `p` or `1p`

And here's the metadata from SHA 36e496edd:

tree 6de5973ef284c1024deac52c12785a087a2cf23f
parent 01008770cc4fecbeae4b01a3cb7f38832e1e302d
parent 840c62324807e7451c9d16dd16ef67890aba625c

Tested against

NVIM v0.2.0-870-g6a68a922
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Jan 12 2017 08:48:31)
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Jan 15 2016 01:33:29)

gregsexton / gitv

Parent command with count other than 1 not working #116