Cutting formatted text (inside layout columns) and pasting into another column on the same page breaks the published version of page

Issue Summary

• Cutting formatted content from the current page that uses layouts (text using Heading 1, for example) and pasting it into the same page end up breaking the published version of the page, displaying "Unsupported Content" once the page is published

Steps to Reproduce

1. Create a page using the new editor;
2. Add a two-column layout into the page;
3. Add a line of text on each column and select Heading 1 formatting for both; (Screenshot 1) - This also works for Headings 1 to 3
4. Now select the text from one of these two columns (e.g. the first column) cut it (Command or Control + X) and paste it into the other column; (Screenshot 2)
5. Publish the page;

Screenshot 1

Screenshot 2

Expected Results

• Page to be correctly published

Actual Results

• Unsupported Content is displayed in the published version of the page
  

Workaround

Remove the formatting before copying the content of the column, and once pasted into position re-add the desired formatting.