ServerRoute middleware chain context not merged but replaced

[xtmu]

Which project does this relate to?

Start

Describe the bug

const testParentMiddleware = createMiddleware({ type: "request" }).server(
  async ({ next, request }) => {
    console.info("In: testParentMiddleware");
    const result = await next({ context: { testParent: true } });
    result.response.headers.set("x-test-parent", "true");
    console.info("Out: testParentMiddleware");
    return result;
  },
);

const testMiddleware = createMiddleware({ type: "request" })
  .middleware([testParentMiddleware])
  .server(async ({ next, request }) => {
    console.info("In: testMiddleware");
    const result = await next({ context: { test: true } });
    result.response.headers.set("x-test", "true");

    console.info("Out: testMiddleware");
    return result;
  });

export const ServerRoute = createServerFileRoute("/api/users")
  .middleware([userLoggerMiddleware, testParentMiddleware, testMiddleware])
  .methods({
    GET: async ({ request, context }) => {
      console.info("GET /api/users @", request.url);
      console.info("Fetching users... @", request.url);
      console.info("Context:", context); // context inferred type is { testParent: boolean; test: boolean; }, but actually got { test:true }, expected is {test:true,testParent:true}
      const res = await fetch("https://jsonplaceholder.typicode.com/users");
      if (!res.ok) {
        throw new Error("Failed to fetch users");
      }

      const data = (await res.json()) as Array<User>;

      const list = data.slice(0, 10);

      return json(list.map((u) => ({ id: u.id, name: u.name, email: u.email })));
    },
  });

Your Example Website or App

https://github.com/xtmu/start-basic

Steps to Reproduce the Bug or Issue

1. npm run dev
2. go to page /api/users
3. check app server log, found Context: { test: true }

Expected behavior

1. npm run dev
2. go to page /api/users
3. check app server log, found Context: { testParent:true, test: true }

Screenshots or Videos

No response

Platform

• Router / Start Version: [1.124.0]
• OS: [Linux]
• Browser: [ Firefox]
• Browser Version: [e.g. 91.1]
• Bundler: [e.g. vite]
• Bundler Version: [e.g. 7.0.0]

Additional context

No response