diff --git a/.changeset/honest-rabbits-glow.md b/.changeset/honest-rabbits-glow.md
new file mode 100644
index 000000000000..92494aeb0900
--- /dev/null
+++ b/.changeset/honest-rabbits-glow.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: cleanup `each` items in legacy mode
diff --git a/packages/svelte/src/internal/client/dom/blocks/await.js b/packages/svelte/src/internal/client/dom/blocks/await.js
index 99bdc0000cc7..d3dce2065927 100644
--- a/packages/svelte/src/internal/client/dom/blocks/await.js
+++ b/packages/svelte/src/internal/client/dom/blocks/await.js
@@ -2,7 +2,12 @@
 import { DEV } from 'esm-env';
 import { is_promise } from '../../../shared/utils.js';
 import { block, branch, pause_effect, resume_effect } from '../../reactivity/effects.js';
-import { internal_set, mutable_source, source } from '../../reactivity/sources.js';
+import {
+	internal_set,
+	mutable_source,
+	remove_from_legacy_sources,
+	source
+} from '../../reactivity/sources.js';
 import { flushSync, set_active_effect, set_active_reaction } from '../../runtime.js';
 import {
 	hydrate_next,
@@ -62,6 +67,11 @@ export function await_block(node, get_input, pending_fn, then_fn, catch_fn) {
 	var error_source = (runes ? source : mutable_source)(undefined);
 	var resolved = false;
 
+	function clean_sources() {
+		remove_from_legacy_sources(input_source);
+		remove_from_legacy_sources(error_source);
+	}
+
 	/**
 	 * @param {PENDING | THEN | CATCH} state
 	 * @param {boolean} restore
@@ -79,17 +89,29 @@ export function await_block(node, get_input, pending_fn, then_fn, catch_fn) {
 		try {
 			if (state === PENDING && pending_fn) {
 				if (pending_effect) resume_effect(pending_effect);
-				else pending_effect = branch(() => pending_fn(anchor));
+				else
+					pending_effect = branch(() => {
+						pending_fn(anchor);
+						return clean_sources;
+					});
 			}
 
 			if (state === THEN && then_fn) {
 				if (then_effect) resume_effect(then_effect);
-				else then_effect = branch(() => then_fn(anchor, input_source));
+				else
+					then_effect = branch(() => {
+						then_fn(anchor, input_source);
+						return clean_sources;
+					});
 			}
 
 			if (state === CATCH && catch_fn) {
 				if (catch_effect) resume_effect(catch_effect);
-				else catch_effect = branch(() => catch_fn(anchor, error_source));
+				else
+					catch_effect = branch(() => {
+						catch_fn(anchor, error_source);
+						return clean_sources;
+					});
 			}
 
 			if (state !== PENDING && pending_effect) {
diff --git a/packages/svelte/src/internal/client/dom/blocks/each.js b/packages/svelte/src/internal/client/dom/blocks/each.js
index 954dcb221461..4c3971e90370 100644
--- a/packages/svelte/src/internal/client/dom/blocks/each.js
+++ b/packages/svelte/src/internal/client/dom/blocks/each.js
@@ -32,7 +32,12 @@ import {
 	pause_effect,
 	resume_effect
 } from '../../reactivity/effects.js';
-import { source, mutable_source, internal_set } from '../../reactivity/sources.js';
+import {
+	source,
+	mutable_source,
+	internal_set,
+	remove_from_legacy_sources
+} from '../../reactivity/sources.js';
 import { array_from, is_array } from '../../../shared/utils.js';
 import { INERT } from '#client/constants';
 import { queue_micro_task } from '../task.js';
@@ -549,7 +554,16 @@ function create_item(
 	current_each_item = item;
 
 	try {
-		item.e = branch(() => render_fn(anchor, v, i, get_collection), hydrating);
+		item.e = branch(() => {
+			render_fn(anchor, v, i, get_collection);
+			// we only need to clean this up if the item is reactive and mutable
+			// because that's when we add the source to the context preventing garbage collection of it
+			if (reactive && mutable) {
+				return () => {
+					remove_from_legacy_sources(item.v);
+				};
+			}
+		}, hydrating);
 
 		item.e.prev = prev && prev.e;
 		item.e.next = next && next.e;
diff --git a/packages/svelte/src/internal/client/reactivity/sources.js b/packages/svelte/src/internal/client/reactivity/sources.js
index 40a3e4e77f14..13b4a6f112f9 100644
--- a/packages/svelte/src/internal/client/reactivity/sources.js
+++ b/packages/svelte/src/internal/client/reactivity/sources.js
@@ -112,6 +112,20 @@ export function mutable_source(initial_value, immutable = false) {
 	return s;
 }
 
+/**
+ * @param {Source} source
+ */
+export function remove_from_legacy_sources(source) {
+	if (
+		legacy_mode_flag &&
+		component_context !== null &&
+		component_context.l !== null &&
+		component_context.l.s !== null
+	) {
+		component_context.l.s = component_context.l.s.filter((s) => s !== source);
+	}
+}
+
 /**
  * @template V
  * @param {Value<V>} source