Can't copy Page with complex JIRA Issue/Filter macros set as Total issue count

Issue Summary

When a page has some JIRA Issue/Filter macros set to display Total issue count, if these macros take too much time to return results, the page can't be copied, with a 500 http response after 3 minutes.

Steps to Reproduce

1. Create a page in the new editor
2. Add around 10 JIRA Issue/Filter macros set to display Total issue count
3. Set their filters to be complex ones or to return a high number of results, in such a way that they will take some seconds to return results
4. Publish the page and try to create a copy

Expected Results

The page should be copied

Actual Results

After 3 minutes, the following error is shown:

Page unavailable
Please check Atlassian Status for any known issues.
If your page hasn't appeared again in 5-10 minutes, please contact our support team.

Workaround

The available workaround at the moment is to login with a user without access to Jira and then copy the page.