[Roadmap Macro] Bars not showing correct dates, differing view between edit/view modes

There is an issue where the roadmap macro shows incorrect dates in normal page-view mode, but the storage format, and edit mode render correctly.

Edit Mode
Shows correctly (as placed by the user):

View Mode
Incorrect display:

The Edit Placeholder.png graphic also renders incorrectly

Behind the scenes, the storage data is correct:

• Raw: Storage Format - raw.txt
• JSON Prettified extract: Storage Format - Prettified Extract.txt

Taking the first swimlane as an example, and tidying up the storage format – you get the following:

         "bars":[ 
            { 
               "title":"BAR-A",
              "startDate":"2015-09-27 23:20:11",
...
            },
            { 
               "title":"BAR-C",
               "startDate":"2015-09-28 04:19:36",
...
            },
            { 
               "startDate":"2015-09-28 02:39:48",
               "title":"BAR-B",
...
            }

All startdate values show 2015-09-27 or 2015-09-28 ... but the "view" render clearly two of the items clearly in the week before.

We're a few dot-releases behind, but I've checked all the release notes and don't see any fix that would address this.
This may be the same issue as reported here - CONF-38800, but I wasn't certain sorry.
I've tried to include additional debug information to isolate the problem.

–

This makes the roadmap macro quite unusable – as it's for 99% of users (e.g. not the author) it is communicating incorrect dates.