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Inner details of third-3

{
    "id": 3,
    "title": "third"
}

You can change or remove the URL before the ID (3) and the page should still load.

Note, however, that changing the parent slug will not heal that part of the URL as there is currently no clean way (that I know) to "listen" to that and invalidate it without checking on every nested child request, which is likely wasted performance and sacrifices loading time for little gains.