Moving parent pages with multiple children pages to another space doesn't work

Issue Summary

When you have a parent page with over 2,500 children pages. Moving that page and it's child pages to another space doesn't succeed and generates a 503 error message hidden behind the below message:

We’re having issues moving this pageRefresh the page, and try moving again. If that doesn’t solve the issue, try again later. 

Steps to Reproduce

1. Have a parent page with 2,500+ children pages
2. Attempt to move that through the UI Move Page feature to another space with the children pages.

Expected Results

The pages should be moved successfully

Actual Results

The below error is thrown:

We’re having issues moving this pageRefresh the page, and try moving again. If that doesn’t solve the issue, try again later. 

Which is masking a 503 error:

Failed to load resource: the server responded with a status of 503 () 

Workaround

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