The test restore sites are restorations of the backups with the URL replaced in the site.

However, if there are .htaccess rules, or plugins that implement certain redirects for the site, then the test restores will essentially be subject to the redirection also.

This is, unfortunately, unavoidable by the nature of what the test restore system is.

If your site is configured with core redirection in-place, it might be an idea to remove this if it isn't necessary, or use something like CloudFlare to redirect traffic based on page rules before traffic ever reaches the site itself.