Issue Summary

After migrating from On-Prem to Cloud using CCMA, we are not able to convert the page to the new editor. While converting the page, we are able to see the "preview" of the page as expected. However, when the "Convert page" option is selected, the content of the page is lost, and we see a blank page in the edit mode of the page.
If we publish the page, the empty page will be published.

Note: This is a large page.

Steps to Reproduce

1. Access the affected page and Click on edit.
3. Here we might see the message "Some page elements aren't supported in the new editor", click on preview.
4. We are able to see the "preview of the page"; now click "Convert Page."
5. The resultant page we get has no content, even though the preview showed data.

Expected Results

The converted page should contain the same content that we are able to see in the preview.

Actual Results

The draft body is empty in the Database after page conversion. Somewhere in the conversion process we are losing the draft's body content.

Workaround

1. Revert to old version and continue in Tiny editor.
2. Apply the workaround specified in bug: CONFCLOUD-78980, ie, removing text color and background color from the text on the page and then retrying page conversion.