New Post: Composite 4.3 Function Preview Bug

I'm not sure that my JQuery file is the problem, When I load that function preview, the image that comes out of PhantomJS is:

http://pasteboard.co/1BNaWTub.png

What it should be displaying is:

http://pasteboard.co/1BNeCw3H.png

Phantom is outputting rendered HTML from the page template, not just the function.