Fails with `Error: The script will never generate a response.` on cloudflare pages

This is similar to #865, however unlike in that issue I create the postgres client on each request and still get following error on cloudflare pages with "compatibility_flags": ["nodejs_compat"]

✘ [ERROR] A hanging Promise was canceled. This happens when the worker runtime is waiting for a Promise from JavaScript to resolve, but has detected that the Promise cannot possibly ever resolve because all code and events related to the Promise's I/O context have already finished.
[wrangler:inf] GET /api/test 500 Internal Server Error (8ms)
✘ [ERROR] Uncaught (in response) Error: The script will never generate a response.

Using it as follows

app.get("/api/test", async (c) => {
  console.log("test route");
  const sql = postgres(c.env.DATABASE_URL);
  const users = await sql`
    select *
    from users`;
  // users = Result [{ name: "Walter", age: 80 }, { name: 'Murray', age: 68 }, ...]
  return c.json(users);
});

Start by reproducing the /api/test route on Cloudflare Pages with the nodejs_compat compatibility flag, using the per-request postgres(c.env.DATABASE_URL) setup shown. Trace the query and response lifecycle; done means the route returns the users as JSON without the hanging-Promise or “never generate a response” errors.