Hex characters not rendering after upgrading from Ember 1.7 to Ember/CLI 2.6

Does anyone have any insight into what might be different in Ember/Ember CLI, compared to a Rails delivered global app, to not render hex characters correctly?

I have/had an Ember 1.7 app that I build a Math Editor in. I render very simple buttons with hex chars like ∛ (<div>&#x221b;</div>) but in the new CLI app it gets escaped.

Im just curious if there is a setting or something that I missing in the way CLI handles templates that may be causing this issue.