[Resolved] I get a redirect loop on my test websites after upgrading WPML to 4.8.6

Problem:
After upgrading WPML to version 4.8.6, the client's test websites experienced toggling between the English and Dutch pages until an NS_ERROR_REDIRECT_LOOP was reported in the browser, indicating that the page isn’t redirecting properly.
Solution:
We recommended creating a staging environment of the website and running it with a minimal setup to determine if the problem persists. The client should:
1) Update WordPress to version 6.9.
2) Deactivate all additional plugins not related to WPML and our add-ons to see if the issue still occurs. If it does, we will attempt to replicate it on a test site.
3) If the problem disappears, gradually reactivate the plugins one by one or in small groups to identify the plugin causing the issue.

If this solution does not resolve the issue or seems irrelevant due to updates or different circumstances, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML support forum for further assistance.