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I won't put this as an answer as I don't like the third party extension route, but this exists - extensions.joomla.org/extensions/extension/authoring-a-content/… - If you can do this without third party extensions, then do so, even if the configuration takes a bit longer.
Have you got any SEO extensions installed that could be overriding how Joomla is handling URLs? Are you using Joomla's core blog, or a third party extension? I can't replicate your issue with core Joomla.