Body content only exists after JavaScript rendering

What this means

The server sends an almost empty shell and the large majority of this page's text arrives only once JavaScript executes. Rendering is a deferred, resource-limited second pass for Google, and other crawlers and AI answer engines frequently do not render at all — so the page's actual content may never be seen.

How to fix it

Server-render or statically generate the primary content. A client-side hydration layer on top of real server HTML is fine; an empty <div id="root"> is not.

Fix effort

This check needs a developer fix: it turns on a routing, hosting or infrastructure decision that no automatic edit can make safely.

Authoritative source

https://developers.google.com/search/docs/crawling-indexing/javascript/javascript-seo-basics