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Multi Site support
URL patterns on a headless site are usually configured in the frontend framework (such as Next.js or Gatsby). Wagtail by default, resolves URLs to pages using their slugs and location in the page tree.
The impact of this is that "view live" links in the admin may resolve to the wrong URL, if the URL patterns configured in the frontend framework don't match the page structure. If rich text is rendered server-side, this will affect any internal links in rich text fields too.