Unable to copy Parent Pages with children pages to another space

Issue Summary

If you have a parent page with any number of children pages. Then you attempt to copy that parent page while including the children page to another space. You'll be presented with an error that stops you from accomplishing this.

Steps to Reproduce

1. Have a parent page with children pages
2. On the parent page click on the cog icon (...)
3. Click on Copy Page
4. Select the space you want to copy the page to
5. Include the Children page
6. Click Next
7. You can fill out any of the 3 boxes. It doesn't change the outcome.
8. Click on Copy
9. You'll be presented with the error

Expected Results

Should be able to copy parent pages and their children pages to another space.

Actual Results

Unable to copy parent pages and their children pages to another space. 
HTTP Request:

Request URL: https://<SITENAME>.atlassian.net/wiki/rest/api/content/<CONTENTID>/pagehierarchy/copy
Request Method: POST
Status Code: 400 
Remote Address: 18.234.32.175:443
Referrer Policy: origin

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available