Dynamic macros do not render in template preview

Issue Summary

When dynamic macros are inserted into a new template, the user previews the template, the macro fails to render with the following message: "Error rendering macro '<macro-key>' : Page loading failed".

Steps to Reproduce

1. Create a new template and insert a dynamic content macro.

1. Save the template.
2. Preview the template.

Expected Results

Preview renders the macro.

Actual Results

Macro fails to load with the message:

Error rendering macro '<macro-key>' : Page loading failed 

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available