Creating pages from templates do not work if an archived page has the same title as the parent/indexing template page

Issue Summary

Upon creating pages using certain templates like the product requirements one, a parent/indexing page will be created to display all pages using this template, called "Product requirements".

If a page with the same title as the parent/indexing page gets archived, creating a page using the template in question will not work.

Steps to Reproduce

In this example, we will be using the Product requirements template.

1. Create a page called "Product requirements". Alternatively, go to a personal space that got automatically created, which will have a page called Product requirements as a child from the "Sample pages" ** one.
2. Archive the page in question.
3. Go back to the space and create a page using the Product requirements template, giving it a random title.

Expected Results

The page should be created and the parent/indexing should append a (2) to the title, which is what happens if the page is not archived.

Actual Results

The page is not created and the following message is displayed (also covered in CONFCLOUD-74687):

We're having trouble connectin right now

Give us a few seconds to reconnec, and you can resume your work

On the top-right:

Something's gone wrong.

Try again later.

From the browser's console, the following is observed:

Request URL: https://<INSTANCE-name>.atlassian.net/wiki/rest/api/content/blueprint/instance/<ID>?status=draft
Request Method: PUT
Status Code: 500 
...
message: "com.atlassian.confluence.pages.DuplicateDataRuntimeException: A page already exists with the title Product requirements in the space with key <SPACE-KEY>"
statusCode: 500 

Workaround

Different workarounds can be used for this one:

• Unarchive the page, which will have the parent/indexing page created with an extra (2) in the title.
• Change the title of the archived page after unarchiving it so it can be archived again.
• Delete the page with the same title from the parent/indexing page.