Describe the bug
Since version 0.8.8, Reflex fails to build projects that include a custom React component (via rx.NoSSRComponent or rx.Component) — throwing a syntax error about a duplicate identifier during the production build.

This issue did not occur in version 0.8.7 and only started after upgrading to 0.8.8.

To Reproduce

1. Create a custom JS component and wrap it in a Reflex class:
   class UnicoSDK(rx.NoSSRComponent):
   library = "/public/components/unico_sdk_component.jsx"
   tag = "WidgetUnico"
   lib_dependencies: list[str] = ["idpay-b2b-sdk"]

   token: rx.Var[str]
   transactionId: rx.Var[str]
   env: rx.Var[str]
   callback: rx.EventHandler[lambda e: [e]]

2. Inside the JSX file, define the component normally:
   export default function WidgetUnico({ token, transactionId, env, callback }) {
   useEffect(() => {
   (async () => {
   const mod = await import("idpay-b2b-sdk");
   const sdk = mod?.IDPaySDK || mod?.default?.IDPaySDK || mod;
   sdk.init({ type: "IFRAME", env });
   sdk.open({ transactionId, token, onFinish: callback });
   })();
   }, [token, transactionId, callback]);

   return <div id="unico-container" style={{ width: 400, height: 400 }} />;
   }

3. Observe the error:
   SyntaxError: Identifier 'WidgetUnico' has already been declared.
   at /.../.web/app/routes/._index.jsx:13:6

• Code/Link to Repo:

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Specifics (please complete the following information):
• Reflex version: 0.8.16
• Python version: 3.14
• OS: macOS 15.7 (M1 Pro)
• Build tool: Bun 1.3.0, Node 24.5.0
• Deployment: Docker
• Deployment: Docker

Additional context
• The issue seems related to how Reflex injects component imports into the generated .web/app/routes/*.jsx files.
• The generated file declares the component twice :
import WidgetUnico from "$/public/js/unico_sdk_component.jsx"
const WidgetUnico = ClientSide(lazy(() => import('$/public/js/unico_sdk_component.jsx')))

Temporary workaround
Downgrading to Reflex 0.8.7 avoids the problem — the component builds and works normally.