Update src/content/docs/en/guides/middleware.mdx

src/content/docs/en/guides/middleware.mdx

@@ -14,7 +14,7 @@ Middleware is available in both SSG and SSR Astro projects.
 :::note
 On all prerendered pages, the middleware runs only during the **build process** to create static pages and does not run in the deployed website. This applies to all pages in a `static` (SSG) project. This also includes prerendered pages in `hybrid` mode (default) and any pages in `server` mode with `export const prerender = true`, including 404 and 500 pages.
 
-For on-demand rendered pages in `server` (default) or `hybrid` (with `export const prerender = false`) mode, the middleware runs in the deployed website when the route is requested. If a route is not found, the middleware will run for the 404 page, unless it is prerendered.
+For on-demand rendered pages in `server` (default) or `hybrid` (with `export const prerender = false`) mode, the middleware runs in the deployed website when the route is requested. If a route is not found, the middleware will run for the 404 page, unless it is prerendered. Some adapters may show a platform-specific 404 page instead, in which case the middleware will not run.
 :::
 
 ## Basic Usage