diff --git a/.changeset/fuzzy-falcons-tan.md b/.changeset/fuzzy-falcons-tan.md
new file mode 100644
index 000000000000..45323269d56e
--- /dev/null
+++ b/.changeset/fuzzy-falcons-tan.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Marks internal `vite-plugin-fileurl` plugin with `enforce: 'pre'`
diff --git a/packages/astro/src/core/create-vite.ts b/packages/astro/src/core/create-vite.ts
index 23a4068a8bda..7fbfe60ddd71 100644
--- a/packages/astro/src/core/create-vite.ts
+++ b/packages/astro/src/core/create-vite.ts
@@ -151,7 +151,7 @@ export async function createVite(
 			astroPrefetch({ settings }),
 			astroTransitions({ settings }),
 			astroDevToolbar({ settings, logger }),
-			vitePluginFileURL({}),
+			vitePluginFileURL(),
 			astroInternationalization({ settings }),
 			settings.config.experimental.serverIslands && vitePluginServerIslands({ settings }),
 			astroContainer(),
diff --git a/packages/astro/src/vite-plugin-fileurl/index.ts b/packages/astro/src/vite-plugin-fileurl/index.ts
index 4a14323a0759..73132f3af979 100644
--- a/packages/astro/src/vite-plugin-fileurl/index.ts
+++ b/packages/astro/src/vite-plugin-fileurl/index.ts
@@ -1,8 +1,9 @@
 import type { Plugin as VitePlugin } from 'vite';
 
-export default function vitePluginFileURL({}): VitePlugin {
+export default function vitePluginFileURL(): VitePlugin {
 	return {
 		name: 'astro:vite-plugin-file-url',
+		enforce: 'pre',
 		resolveId(source, importer) {
 			if (source.startsWith('file://')) {
 				const rest = source.slice(7);
diff --git a/packages/integrations/preact/src/client.ts b/packages/integrations/preact/src/client.ts
index fdf615659ea5..39ad1f0f6cf2 100644
--- a/packages/integrations/preact/src/client.ts
+++ b/packages/integrations/preact/src/client.ts
@@ -18,13 +18,13 @@ export default (element: HTMLElement) =>
 		let signalsRaw = element.dataset.preactSignals;
 		if (signalsRaw) {
 			const { signal } = await import('@preact/signals');
-			let signals: Record<string, string | { id: string; i: number }[]> = JSON.parse(
+			let signals: Record<string, string | [string, number][]> = JSON.parse(
 				element.dataset.preactSignals!,
 			);
 			for (const [propName, signalId] of Object.entries(signals)) {
 				if (Array.isArray(signalId)) {
-					signalId.forEach(({ id, i }) => {
-						const [valueOfSignal, indexInProps] = props[propName][i];
+					signalId.forEach(([id, indexInPropsArray]) => {
+						const [valueOfSignal, indexInProps] = props[propName][indexInPropsArray];
 						if (!sharedSignalMap.has(id)) {
 							const signalValue = signal(valueOfSignal);
 							sharedSignalMap.set(id, signalValue);
diff --git a/packages/integrations/preact/src/signals.ts b/packages/integrations/preact/src/signals.ts
index ad04ac9ce0cf..89eaabd568df 100644
--- a/packages/integrations/preact/src/signals.ts
+++ b/packages/integrations/preact/src/signals.ts
@@ -37,8 +37,8 @@ export function serializeSignals(
 					props[key] = props[key].map((v: SignalLike, i: number) =>
 						i === index ? [signal.peek(), i] : v,
 					);
-
 					map.set(key, [...((map.get(key) || []) as []), [signal, index]]);
+
 					signals[key] = [...((signals[key] || []) as []), [getSignalId(ctx, signal), index]];
 				}
 			});