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Why preview breaks
A WordPress preview can be perfectly valid while Astro still looks dead.
The editor clicks Preview, WordPress opens a URL, and Astro answers with a 404 or yesterday’s version. That usually feels like a content error, but it is not. WordPress can preview unpublished revisions inside its own authenticated world; a static Astro site only knows whatever content was fetched during the last build.
Until Astro is given a preview-aware path—typically SSR, on-demand rendering, or a signed draft endpoint—it has nothing to render for that draft. In other words, the failure is structural, not editorial: WordPress is showing future data, while Astro is serving frozen data.
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