3 files changed, 7 insertions, 9 deletions
diff --git a/packages/integrations/react/package.json b/packages/integrations/react/package.json
index 3c899620c..1ce3c5032 100644
--- a/packages/integrations/react/package.json
+++ b/packages/integrations/react/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@astrojs/react",
   "description": "Use React components within Astro",
-  "version": "3.6.3",
+  "version": "3.6.3-beta.0",
   "type": "module",
   "types": "./dist/index.d.ts",
   "author": "withastro",
@@ -51,7 +51,7 @@
   "dependencies": {
     "@vitejs/plugin-react": "^4.3.3",
     "ultrahtml": "^1.5.3",
-    "vite": "^5.4.10"
+    "vite": "6.0.0-beta.6"
   },
   "devDependencies": {
     "@types/react": "^18.3.12",
diff --git a/packages/integrations/react/server.js b/packages/integrations/react/server.js
index 69b0a8e12..9c3c309cc 100644
--- a/packages/integrations/react/server.js
+++ b/packages/integrations/react/server.js
@@ -126,11 +126,7 @@ async function getFormState({ result }) {
 	 * This matches the endpoint path.
 	 * @example "/_actions/blog.like"
 	 */
-	const actionName =
-		searchParams.get('_astroAction') ??
-		/* Legacy. TODO: remove for stable */ formData
-			.get('_astroAction')
-			?.toString();
+	const actionName = searchParams.get('_action');
 
 	if (!actionKey || !actionName) return undefined;
 
diff --git a/packages/integrations/react/src/actions.ts b/packages/integrations/react/src/actions.ts
index a5ccb2f9a..06ecd4148 100644
--- a/packages/integrations/react/src/actions.ts
+++ b/packages/integrations/react/src/actions.ts
@@ -26,7 +26,7 @@ export function experimental_withState<T>(action: FormFn<T>) {
 	// Called by React when form state is passed from the server.
 	// If the action names match, React returns this state from `useActionState()`.
 	callback.$$IS_SIGNATURE_EQUAL = (incomingActionName: string) => {
-		const actionName = new URLSearchParams(action.toString()).get('_astroAction');
+		const actionName = new URLSearchParams(action.toString()).get('_action');
 		return actionName === incomingActionName;
 	};
 
@@ -46,7 +46,9 @@ export function experimental_withState<T>(action: FormFn<T>) {
  */
 export async function experimental_getActionState<T>({
 	request,
-}: { request: Request }): Promise<T> {
+}: {
+	request: Request;
+}): Promise<T> {
 	const contentType = request.headers.get('Content-Type');
 	if (!contentType || !isFormRequest(contentType)) {
 		throw new AstroError(