Meteor, Reactive Array Rendering Issues On Update

I have a nested template, using a ReactiveDict to store the data, which is an object that includes variables (color, type...) and an array of children nodes. I'm having an issue on

Solution 1:

well I guess I asked just before figuring it out... the '_id' thing did the trick. I had tried before but I was actually using the same _id for the same elements so they did not appear to change (duh!)

So by adding a { "_id": Meteor.uuid() } in my generated objects, the update works fine.