diff --git a/.changeset/tasty-trainers-sell.md b/.changeset/tasty-trainers-sell.md
new file mode 100644
index 0000000000..4a2dd09fa6
--- /dev/null
+++ b/.changeset/tasty-trainers-sell.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: don't destroy contents of `svelte:boundary` unless the boundary is an error boundary
diff --git a/packages/svelte/src/internal/client/dom/blocks/boundary.js b/packages/svelte/src/internal/client/dom/blocks/boundary.js
index b7f1803782..d4582024f7 100644
--- a/packages/svelte/src/internal/client/dom/blocks/boundary.js
+++ b/packages/svelte/src/internal/client/dom/blocks/boundary.js
@@ -285,6 +285,12 @@ export class Boundary {
 		var onerror = this.#props.onerror;
 		let failed = this.#props.failed;
 
+		// If we have nothing to capture the error, or if we hit an error while
+		// rendering the fallback, re-throw for another boundary to handle
+		if (this.#is_creating_fallback || (!onerror && !failed)) {
+			throw error;
+		}
+
 		if (this.#main_effect) {
 			destroy_effect(this.#main_effect);
 			this.#main_effect = null;
@@ -346,12 +352,6 @@ export class Boundary {
 			}
 		};
 
-		// If we have nothing to capture the error, or if we hit an error while
-		// rendering the fallback, re-throw for another boundary to handle
-		if (this.#is_creating_fallback || (!onerror && !failed)) {
-			throw error;
-		}
-
 		var previous_reaction = active_reaction;
 
 		try {
diff --git a/packages/svelte/tests/runtime-runes/samples/non-error-boundary-preserve-on-error/_config.js b/packages/svelte/tests/runtime-runes/samples/non-error-boundary-preserve-on-error/_config.js
new file mode 100644
index 0000000000..7654cf1360
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/non-error-boundary-preserve-on-error/_config.js
@@ -0,0 +1,20 @@
+import { test } from '../../test';
+import { flushSync } from 'svelte';
+
+export default test({
+	test({ assert, target }) {
+		const [button] = target.querySelectorAll('button');
+
+		assert.throws(() => {
+			flushSync(() => button.click());
+		}, /oops/);
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<button>throw</button>
+				<p>some content</p>
+			`
+		);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/non-error-boundary-preserve-on-error/main.svelte b/packages/svelte/tests/runtime-runes/samples/non-error-boundary-preserve-on-error/main.svelte
new file mode 100644
index 0000000000..1c3f062b43
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/non-error-boundary-preserve-on-error/main.svelte
@@ -0,0 +1,19 @@
+<script lang="ts">
+	let should_throw = $state(false);
+
+	function throw_error() {
+		throw new Error('oops');
+	}
+</script>
+
+<button onclick={() => should_throw = true}>
+	throw
+</button>
+
+<svelte:boundary>
+	<p>some content</p>
+
+	{#if should_throw}
+		{throw_error()}
+	{/if}
+</svelte:boundary>