"When I make a request to the route configured by TRPC /api/trpc/[trpc], it is returning the default Nextjs 404 page as if it were considering that route as a page.

// app/api/trpc/[trpc]/route.ts
import { appRouter } from "@/server/routers/_app";
import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
import { createContext } from "@/server/context";

function handler(request: Request) {
  return fetchRequestHandler({
    endpoint: "/api/trpc",
    req: request,
    router: appRouter,
    createContext,
  });
}

export { handler as GET, handler as POST };

The error occurs exclusively for this route because all other pages work, and other API Routes also work, including the TRPCClient, which makes the request, but there is an issue with parsing the response: TRPCClientError: Unexpected token < in JSON at position 0 because the response is HTML (404 Page Not Found) and not JSON.

What could be happening?"

# Next Info
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 22.5.0: Mon Apr 24 20:53:44 PDT 2023; root:xnu-8796.121.2~5/RELEASE_ARM64_T8103
Binaries:
  Node: 18.14.2
  npm: 9.5.0
  Yarn: 1.22.19
  pnpm: N/A
Relevant Packages:
  next: 13.5.5-canary.0
  eslint-config-next: 13.4.19
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 5.2.2
Next.js Config:
  output: N/A