Markup Macro doesn't work on Published Pages

Summary

Markup Macro doesn't work on Published Pages

Steps to Reproduce

1. Create a Page and Publish it
2. Edit the Page
3. Insert a Markup Macro
4. Put any text on the field
5. Click 'Insert'

Expected Results

The macro should be inserted on the page.

Actual Results

The pop-up macro goes blank and freezes.