diff --git a/.changeset/server-functions-host-environments.md b/.changeset/server-functions-host-environments.md
new file mode 100644
index 00000000..cc3e836d
--- /dev/null
+++ b/.changeset/server-functions-host-environments.md
@@ -0,0 +1,5 @@
+---
+'@solidjs/vite-plugin': patch
+---
+
+In dev, the server function manifest is now invalidated in every Vite environment, not just `client` and `ssr`. A host that imports the generated handler from a server environment of its own, such as Void's `void_worker` or a Cloudflare worker, kept a stale manifest before. A server function that only the client referenced then failed with "not part of the deployment" until the dev server restarted.
diff --git a/src/server-functions/environments.test.ts b/src/server-functions/environments.test.ts
new file mode 100644
index 00000000..2987ac57
--- /dev/null
+++ b/src/server-functions/environments.test.ts
@@ -0,0 +1,63 @@
+import { mkdtemp, mkdir, realpath, rm, symlink, writeFile } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { createServer, type ViteDevServer } from 'vite';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { serverFunctions } from './index.js';
+
+const MANIFEST_ID = 'virtual:solid-server-function-manifest';
+
+// A host can own the server side under its own environment name (Void's
+// `void_worker`, a Cloudflare worker) and import the manifest there. A server
+// function the client reaches first has to show up in that environment's
+// manifest too.
+describe('server function manifest in a host-named server environment', () => {
+  let root: string;
+  let server: ViteDevServer;
+
+  async function loadManifest() {
+    const result = await server.environments.worker!.transformRequest(MANIFEST_ID);
+    return result?.code ?? '';
+  }
+
+  beforeAll(async () => {
+    root = await realpath(await mkdtemp(path.join(tmpdir(), 'solid-vite-plugin-env-')));
+    await symlink(
+      fileURLToPath(new URL('../../node_modules', import.meta.url)),
+      path.join(root, 'node_modules'),
+      'dir',
+    );
+    await mkdir(path.join(root, 'src'));
+    await writeFile(
+      path.join(root, 'src/greet.ts'),
+      '"use server";\nexport async function greet(name: string) {\n  return `hello ${name}`;\n}\n',
+    );
+    server = await createServer({
+      root,
+      configFile: false,
+      appType: 'custom',
+      logLevel: 'silent',
+      server: { middlewareMode: true, hmr: false, watch: null },
+      optimizeDeps: { noDiscovery: true, include: [] },
+      environments: {
+        client: {},
+        worker: { consumer: 'server' },
+      },
+      plugins: [serverFunctions()],
+    });
+  });
+
+  afterAll(async () => {
+    await server?.close();
+    await rm(root, { recursive: true, force: true });
+  });
+
+  it('invalidates the manifest in that environment when the client finds a new module', async () => {
+    expect(await loadManifest()).not.toContain('/src/greet.ts');
+
+    await server.environments.client.transformRequest('/src/greet.ts');
+
+    expect(await loadManifest()).toContain('"/src/greet.ts"');
+  });
+});
diff --git a/src/server-functions/index.ts b/src/server-functions/index.ts
index 5bee2d35..ca2cb960 100644
--- a/src/server-functions/index.ts
+++ b/src/server-functions/index.ts
@@ -347,8 +347,13 @@ function invalidateModules(
   manifest: string,
 ): void {
   if (server?.environments && result.invalidPreload) {
-    invalidateModule(server.environments.client.moduleGraph, manifest);
-    invalidateModule(server.environments.ssr.moduleGraph, manifest);
+    // Every environment, not just `client` and `ssr`: a host can load the
+    // manifest from a server environment of its own (`void_worker`, a
+    // Cloudflare worker), and one with no `ssr` environment at all would
+    // otherwise throw here.
+    for (const environment of Object.values(server.environments)) {
+      invalidateModule(environment.moduleGraph, manifest);
+    }
   }
 }