User blog comment:Kirkburn/Technical Update: April 2, 2013/@comment-3335785-20130402231204/@comment-3335785-20130403114724

Ah, so uploading a new image over an old image is not what this bug refers to. That link refers to an image not updating on the file page or where the file is transcluded. It does however update the file source, such as as opposed to File:Photo on 2012-01-15 at 16.27 -2.jpg.