Converting a page with indented headings inside a table macro breaks the page

Issue Summary

If you convert a page that has an indented Heading inside a table macro to the new editor, the conversion happens, and the Fabric editor doesn't show anything in the edit mode.

Steps to Reproduce

1. Create a page using the Legacy editor.
2. Place a table macro.
3. Place a Heading text inside the table macro.
4. Indent the Heading.
5. Publish the page.
6. Edit the page.
7. A message that the page can be converted will be displayed. Click on Preview page button.
8. Click on Preview.
9. Click on Convert.

You can see how it happens in the following video:
conversionissue.mp4

Expected Results

The page's content is visible in edit mode.

Actual Results

Page's content is not visible in edit mode.

Workaround

Before converting the page, outdent the Heading text inside the table.