diff --git a/.changeset/young-pens-exist.md b/.changeset/young-pens-exist.md
new file mode 100644
index 000000000000..55468bba51a3
--- /dev/null
+++ b/.changeset/young-pens-exist.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix manifest not updating when adding routes
diff --git a/packages/kit/src/core/dev/plugin.js b/packages/kit/src/core/dev/plugin.js
index 0736eaca4640..bd5717329acd 100644
--- a/packages/kit/src/core/dev/plugin.js
+++ b/packages/kit/src/core/dev/plugin.js
@@ -50,7 +50,10 @@ export const sveltekit = function (svelte_config) {
 						port: 3000,
 						strictPort: true,
 						watch: {
-							ignored: [`${kit_config.outDir}/**`, `!${kit_config.outDir}/generated/**`]
+							ignored: [
+								// Ignore all siblings of config.kit.outDir/generated
+								`${posixify(kit_config.outDir)}/!(generated)`
+							]
 						}
 					}
 				},
diff --git a/packages/kit/test/apps/basics/test/test.js b/packages/kit/test/apps/basics/test/test.js
index cb159068c791..0fd222ab4c74 100644
--- a/packages/kit/test/apps/basics/test/test.js
+++ b/packages/kit/test/apps/basics/test/test.js
@@ -2370,16 +2370,16 @@ test.describe.parallel('Routing', () => {
 		server.close();
 	});
 
-	test('watch new route in dev', async ({ page, javaScriptEnabled }) => {
+	test('watch new route in dev', async ({ page }) => {
 		await page.goto('/routing');
 
-		if (!process.env.DEV || javaScriptEnabled) {
+		if (!process.env.DEV) {
 			return;
 		}
 
 		// hash the filename so that it won't conflict with
 		// future test file that has the same name
-		const route = 'bar' + new Date().valueOf();
+		const route = 'zzzz' + Date.now();
 		const content = 'Hello new route';
 		const __dirname = path.dirname(fileURLToPath(import.meta.url));
 		const filePath = path.join(__dirname, `../src/routes/routing/${route}.svelte`);