Quoting from emberjs/ember.js#9347 by @mixonic:
The issue here is that dotdotdot is cloning the content you point it at:
And then replacing whatever was on the page with its own generated DOM. There isn’t a way to keep track of the data bindings if the DOM has been re-built.
dotdotdot just doesn’t seem compatible with data-binding. Try commenting out that line in your JSBin, seems to work fine.
And then later in that thread:
It may have worked in 1.7.1, but that was more by chance than design. A 3rd party destroying the DOM nodes that Ember binds to will be a difficult or impossible thing to support.
And in a practical sense, trying to support libraries like this will keep us from ever getting to the amazing rendering performance we want to land with HTMLBars.