From 56013a2c01454388ea5f58642377038f29cdec4a Mon Sep 17 00:00:00 2001
From: Simon H <5968653+dummdidumm@users.noreply.github.com>
Date: Mon, 1 Jun 2026 23:39:50 +0200
Subject: [PATCH] fix: check references for blockers on server, too (#18352)

We forgot the server in #18309

Fixes #18344
---
 .changeset/strong-cups-prove.md                      |  5 +++++
 .../3-transform/server/visitors/shared/utils.js      |  2 +-
 .../Child.svelte                                     |  5 +++++
 .../async-derived-prop-closure-hydration/_config.js  | 11 +++++++++++
 .../async-derived-prop-closure-hydration/main.svelte | 12 ++++++++++++
 5 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/strong-cups-prove.md
 create mode 100644 packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/Child.svelte
 create mode 100644 packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/main.svelte

diff --git a/.changeset/strong-cups-prove.md b/.changeset/strong-cups-prove.md
new file mode 100644
index 0000000000..ad85a1feba
--- /dev/null
+++ b/.changeset/strong-cups-prove.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: check references for blockers on server, too
diff --git a/packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/utils.js b/packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/utils.js
index 62e1c44094..3da6fcf321 100644
--- a/packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/utils.js
+++ b/packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/utils.js
@@ -343,7 +343,7 @@ export class PromiseOptimiser {
 	 * @param {ExpressionMetadata} metadata
 	 */
 	check_blockers(metadata) {
-		for (const binding of metadata.dependencies) {
+		for (const binding of metadata.references) {
 			if (binding.blocker) {
 				this.#blockers.add(binding.blocker);
 			}
diff --git a/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/Child.svelte b/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/Child.svelte
new file mode 100644
index 0000000000..6e5197b2fe
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/Child.svelte
@@ -0,0 +1,5 @@
+<script>
+	let { onclick } = $props();
+</script>
+
+<button {onclick}>A button</button>
diff --git a/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/_config.js b/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/_config.js
new file mode 100644
index 0000000000..37a3f0dae1
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-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, 'foo <button>A button</button>');
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/main.svelte b/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/main.svelte
new file mode 100644
index 0000000000..c87d3f8a08
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-derived-prop-closure-hydration/main.svelte
@@ -0,0 +1,12 @@
+<script>
+	import Button from './Child.svelte';
+
+	async function getFoo() {
+		return 'foo';
+	}
+
+	const foo = $derived(await getFoo());
+</script>
+
+{foo}
+<Button onclick={() => foo} />