Bug report for parse: Duplication of parent on save

gistfile1.js

var Medias = Parse.Object.extend("Medias");
var aMedia = new Medias();

var MediaScores = Parse.Object.extend("MediaScores");
var aMediaScores = new MediaScores();

var MediaViews = Parse.Object.extend("MediaViews");
var aMediaViews = new MediaViews();

aMediaScores.set("media", Medias);
aMediaViews.set("media", Medias);

/*
Using save here, saves two copies of Medias, one for each relation.
When the code I've written I "think" should save 1xMedias and 1xMediaScores and 1xMediaViews
*/
aMediaScores.save(); // or aMediaViews.save() or aMedia.save();