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The SEO plugin can be right while the site still ships the wrong signals.
An editor saves a perfect title tag in WordPress, checks the SEO panel, and everything looks green. Then the live page loads through a JavaScript app or static frontend that never asks WordPress for that field — so the HTML Google receives has no matching title, meta description, or canonical.
That is the real shift in headless WordPress: the CMS still stores content, but it no longer renders the page. SEO becomes split across two systems. WordPress holds the editorial intent; the frontend must print it into the response as tags, structured data, robots directives, and hreflang. If that handoff fails, Google evaluates the frontend output, not the…