404 not rendering, repro state for astro

astro.config.mjs

@@ -17,7 +17,7 @@ import node from "@astrojs/node";
 
 // https://astro.build/config
 export default defineConfig({
-  output: "static",
+  output: "server",
   prefetch: true,
   site: "https://lio.cat",
 

src/pages/404.astro

@@ -1,4 +1,5 @@
 ---
+export const prerender = true
 import MainLayout from "~/layouts/main.astro"
 ---
 

src/pages/[lang]/archive/index.astro

@@ -1,4 +1,5 @@
 ---
+export const prerender = true
 import PostList from "~/components/astro/post-list.astro"
 import { de, en } from "~/config"
 import { getLangFromUrl } from "~/i18n/utils"

src/pages/[lang]/index.astro

@@ -1,4 +1,5 @@
 ---
+export const prerender = true
 import Footer from "~/components/astro/footer.astro"
 import Intro from "~/components/astro/intro.astro"
 import RecentBlogs from "~/components/astro/recent-blogs.astro"

src/pages/[lang]/posts/[...slug].astro

@@ -1,4 +1,5 @@
 ---
+export const prerender = true
 import { render } from "astro:content"
 import { langs } from "~/i18n/ui"
 import { getLangFromUrl } from "~/i18n/utils"

src/pages/[lang]/posts/[slug]/og.png.ts

@@ -1,3 +1,4 @@
+export const prerender = true
 import { getCollection, type CollectionEntry } from "astro:content"
 import fs from "fs"
 import { join, resolve } from "node:path"

src/pages/[lang]/rss.xml.ts

@@ -1,3 +1,4 @@
+export const prerender = true
 import rss from "@astrojs/rss"
 import { de, en } from "~/config"
 import { getPostsByLocale } from "~/utils"

src/pages/[lang]/tags/[tag].astro

@@ -1,4 +1,5 @@
 ---
+export const prerender = true
 import TagComponent from "~/components/astro/tag.astro"
 import { langs } from "~/i18n/ui"
 import { getPostsByLocale } from "~/utils"

src/pages/index.astro

@@ -1,4 +1,5 @@
 ---
+export const prerender = true
 import { defaultLanguage } from "~/config"
 ---
 

src/pages/rss.xml.ts

@@ -1,3 +1,4 @@
+export const prerender = true
 import rss from "@astrojs/rss"
 import { de, defaultLanguage, en } from "~/config"
 import { getPostsByLocale } from "~/utils"