fix: exit resolved async blocks on correct node when hydrating

.changeset/tiny-owls-pay.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: exit resolved async blocks on correct node when hydrating

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;
 	}
 

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>`);
+	}
+});

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}