From c9019c7a1bc99a8fae3e17bb5b09cc5047f9f618 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Thu, 5 Feb 2026 21:50:32 -0500
Subject: [PATCH] fix: exit resolved async blocks on correct node when
 hydrating

---
 .changeset/tiny-owls-pay.md                         |  5 +++++
 .../svelte/src/internal/client/dom/blocks/async.js  |  5 +++++
 .../samples/async-if-hydration/_config.js           | 11 +++++++++++
 .../samples/async-if-hydration/main.svelte          | 13 +++++++++++++
 4 files changed, 34 insertions(+)
 create mode 100644 .changeset/tiny-owls-pay.md
 create mode 100644 packages/svelte/tests/runtime-runes/samples/async-if-hydration/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/async-if-hydration/main.svelte

diff --git a/.changeset/tiny-owls-pay.md b/.changeset/tiny-owls-pay.md
new file mode 100644
index 0000000000..ac25500258
--- /dev/null
+++ b/.changeset/tiny-owls-pay.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: exit resolved async blocks on correct node when hydrating
diff --git a/packages/svelte/src/internal/client/dom/blocks/async.js b/packages/svelte/src/internal/client/dom/blocks/async.js
index 0e3ab33dda..03189a90e8 100644
--- a/packages/svelte/src/internal/client/dom/blocks/async.js
+++ b/packages/svelte/src/internal/client/dom/blocks/async.js
@@ -27,6 +27,11 @@ export function async(node, blockers = [], expressions = [], fn) {
 
 	if (expressions.length === 0 && blockers.every((b) => b.settled)) {
 		fn(node);
+
+		if (was_hydrating) {
+			hydrate_next();
+		}
+
 		return;
 	}
 
diff --git a/packages/svelte/tests/runtime-runes/samples/async-if-hydration/_config.js b/packages/svelte/tests/runtime-runes/samples/async-if-hydration/_config.js
new file mode 100644
index 0000000000..3888c8cf7f
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-if-hydration/_config.js
@@ -0,0 +1,11 @@
+import { tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	mode: ['hydrate'],
+
+	async test({ assert, target }) {
+		await tick();
+		assert.htmlEqual(target.innerHTML, `<div><p>hello</p></div>`);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/async-if-hydration/main.svelte b/packages/svelte/tests/runtime-runes/samples/async-if-hydration/main.svelte
new file mode 100644
index 0000000000..8a057698fd
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-if-hydration/main.svelte
@@ -0,0 +1,13 @@
+<script lang="ts">
+	await 1;
+	let b = true;
+	let a = true;
+</script>
+
+{#if a}
+	<div>
+		{#if b}
+			<p>hello</p>
+		{/if}
+	</div>
+{/if}