From 6a9437da6b85f0182d724b6b34170b41297db8fd Mon Sep 17 00:00:00 2001
From: Nic Polumeyv <162764842+Nic-Polumeyv@users.noreply.github.com>
Date: Thu, 27 Aug 2026 12:20:09 -0400
Subject: [PATCH] fix: discard a consumed preloaded redirect before following
 it

Co-authored-by: Benjamin Davis <davis.benjamin41902@gmail.com>
---
 .changeset/pre/quiet-preload-redirect.md       |  5 +++++
 packages/kit/src/runtime/client/client.js      |  3 +++
 .../preloading/redirect/[step]/+page.server.js | 13 +++++++++++++
 .../preloading/redirect/[step]/+page.svelte    |  1 +
 .../basics/test/cross-platform/client.test.js  | 18 ++++++++++++++++++
 5 files changed, 40 insertions(+)
 create mode 100644 .changeset/pre/quiet-preload-redirect.md
 create mode 100644 packages/kit/test/apps/basics/src/routes/routing/preloading/redirect/[step]/+page.server.js
 create mode 100644 packages/kit/test/apps/basics/src/routes/routing/preloading/redirect/[step]/+page.svelte

diff --git a/.changeset/pre/quiet-preload-redirect.md b/.changeset/pre/quiet-preload-redirect.md
new file mode 100644
index 000000000000..4fc6a4af2540
--- /dev/null
+++ b/.changeset/pre/quiet-preload-redirect.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: don't replay a preloaded redirect when a later hop of the navigation returns to the route
diff --git a/packages/kit/src/runtime/client/client.js b/packages/kit/src/runtime/client/client.js
index 4813816160c5..4a4926079a4b 100644
--- a/packages/kit/src/runtime/client/client.js
+++ b/packages/kit/src/runtime/client/client.js
@@ -2072,6 +2072,9 @@ async function navigate({
 	if (navigation_result.type === 'redirect') {
 		// whatwg fetch spec https://fetch.spec.whatwg.org/#http-redirect-fetch says to error after 20 redirects
 		if (redirect_count < 20) {
+			// a preloaded redirect has been consumed; a later hop back to this route must load afresh
+			if (load_cache?.id === intent?.id) discard_load_cache();
+
 			await navigate({
 				type,
 				url: new URL(navigation_result.location, url),
diff --git a/packages/kit/test/apps/basics/src/routes/routing/preloading/redirect/[step]/+page.server.js b/packages/kit/test/apps/basics/src/routes/routing/preloading/redirect/[step]/+page.server.js
new file mode 100644
index 000000000000..e3a0731be731
--- /dev/null
+++ b/packages/kit/test/apps/basics/src/routes/routing/preloading/redirect/[step]/+page.server.js
@@ -0,0 +1,13 @@
+import { redirect } from '@sveltejs/kit';
+
+/** @type {import('./$types').PageServerLoad} */
+export function load({ cookies, params }) {
+	if (params.step === 'resolve') {
+		cookies.set('preload-redirect-resolved', 'true', { path: '/routing/preloading/redirect' });
+		redirect(303, '/routing/preloading/redirect/target');
+	}
+
+	if (!cookies.get('preload-redirect-resolved')) {
+		redirect(303, '/routing/preloading/redirect/resolve');
+	}
+}
diff --git a/packages/kit/test/apps/basics/src/routes/routing/preloading/redirect/[step]/+page.svelte b/packages/kit/test/apps/basics/src/routes/routing/preloading/redirect/[step]/+page.svelte
new file mode 100644
index 000000000000..69633c218884
--- /dev/null
+++ b/packages/kit/test/apps/basics/src/routes/routing/preloading/redirect/[step]/+page.svelte
@@ -0,0 +1 @@
+<h1>Redirect resolved</h1>
diff --git a/packages/kit/test/apps/basics/test/cross-platform/client.test.js b/packages/kit/test/apps/basics/test/cross-platform/client.test.js
index 6c4601fda6dc..c00406b4248b 100644
--- a/packages/kit/test/apps/basics/test/cross-platform/client.test.js
+++ b/packages/kit/test/apps/basics/test/cross-platform/client.test.js
@@ -1023,6 +1023,24 @@ test.describe('Prefetching', () => {
 		);
 	});
 
+	test('does not replay a preloaded redirect when a later hop returns to the route', async ({
+		page,
+		app
+	}) => {
+		await page.goto('/routing/a');
+
+		// the cookie is unset, so the preload resolves to a redirect to /resolve
+		const target = '/routing/preloading/redirect/target';
+		expect(await app.preloadData(target)).toMatchObject({
+			type: 'redirect',
+			location: '/routing/preloading/redirect/resolve'
+		});
+
+		// /resolve sets the cookie and redirects back to /target, which must now load afresh
+		await app.goto(target);
+		await expect(page.locator('h1')).toHaveText('Redirect resolved');
+	});
+
 	test('chooses correct route when hash route is preloaded but regular route is clicked', async ({
 		app,
 		page