Thanks for posting your question in the Microsoft Q&A forum.
It can be result of local cache or any intermediate
You can use redirect trace extensions like this one to trace.
https://smart.linkresearchtools.com/seo-tools/link-redirect-trace-extension
You can disable redirect cache in your browser for example in chrome you can open the Chrome Developer Tools (F12) Go to the Network tab and make sure Disable cache is ticked Reload (or navigate to) the page you no longer want to be redirected while keeping the dev tools open. This will clear the cached redirect.
Also this article helps you for troubleshooting
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