diff --git a/.changeset/tasty-tires-wait.md b/.changeset/tasty-tires-wait.md
new file mode 100644
index 0000000000..0f3fd2d671
--- /dev/null
+++ b/.changeset/tasty-tires-wait.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: correctly coordinate component-level effects inside async blocks
diff --git a/packages/svelte/src/internal/client/reactivity/effects.js b/packages/svelte/src/internal/client/reactivity/effects.js
index 5bdba037b1..1bbda86fa7 100644
--- a/packages/svelte/src/internal/client/reactivity/effects.js
+++ b/packages/svelte/src/internal/client/reactivity/effects.js
@@ -20,7 +20,6 @@ import {
 	EFFECT,
 	DESTROYED,
 	INERT,
-	REACTION_RAN,
 	BLOCK_EFFECT,
 	ROOT_EFFECT,
 	EFFECT_TRANSPARENT,
@@ -213,7 +212,11 @@ export function user_effect(fn) {
 	// Non-nested `$effect(...)` in a component should be deferred
 	// until the component is mounted
 	var flags = /** @type {Effect} */ (active_effect).f;
-	var defer = !active_reaction && (flags & BRANCH_EFFECT) !== 0 && (flags & REACTION_RAN) === 0;
+	var defer =
+		!active_reaction &&
+		(flags & BRANCH_EFFECT) !== 0 &&
+		component_context !== null &&
+		!component_context.i;
 
 	if (defer) {
 		// Top-level `$effect(...)` in an unmounted component — defer until mount
diff --git a/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/Child.svelte b/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/Child.svelte
new file mode 100644
index 0000000000..18856d71e1
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/Child.svelte
@@ -0,0 +1,6 @@
+<script>
+	let x;
+	$effect(() => console.log(!!x))
+</script>
+
+<div bind:this={x}></div>
diff --git a/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/_config.js b/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/_config.js
new file mode 100644
index 0000000000..7a6e436825
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/_config.js
@@ -0,0 +1,10 @@
+import { tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	// Test that $effect/onMount etc at the top level of components are correctly deferred/coordinated if inside an async block
+	async test({ assert, logs }) {
+		await tick();
+		assert.deepEqual(logs, [true]);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/main.svelte b/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/main.svelte
new file mode 100644
index 0000000000..934d9d7f5b
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-effect-mount-timing/main.svelte
@@ -0,0 +1,5 @@
+<script>
+	import Child from './Child.svelte';
+</script>
+
+<Child foo={await 1} />