Issue Summary

When we have our instance converted to the new editor, sometimes our existing templates remain in the old editor due to not eligible content.
However, when we try to create a new page with this template and it has a template variable, a preview of the template is shown in the new editing experience, and it shows the content broken.

Steps to Reproduce

1. Make sure to have a template in the old editor that contains a template variable;
2. Create a page with this template.

Expected Results

The new page is created and you start to edit your page based on the template.

Actual Results

A template preview is shown in the new editor, showing the content broken.

Workaround

• Even so, proceeding to create the page will load the editor in the old editor.