I have not installed the helper as when I use the parent theme, I do not experience any errors. It is only with the child theme and only in the customizer.

I like the partial edit shortcuts. I think everything is really well laid out and works very very well. I am only using a child theme in order to inject the current date in the footer, if I was able to use a shortcode in the footer then I would have no need for a child theme at all.