withastro/astro astro@6.4.2 on GitHub

#16889 b94bcfd Thanks @Princesseuh! - Fixes a plugins is not iterable crash when using a pre-6.0 @astrojs/mdx alongside integrations (e.g. Starlight) that set markdown.remarkPlugins, markdown.rehypePlugins, or markdown.remarkRehype.
#16878 b9f6bb9 Thanks @fkatsuhiro! - Fixes an issue where on-demand (SSR) dynamic routes would return 404 when a prerendered dynamic route with the same URL pattern was sorted first alphabetically. In production builds with @astrojs/node adapter, if [a_prebuild].astro (prerender=true) came before [b_ssr].astro alphabetically, requests to URLs not in the prerendered route's static paths would 404 instead of falling through to the SSR route. The fix adds fallthrough logic so that when a prerendered dynamic route matches but can't serve the request, Astro tries subsequent matching routes.