next.config rewrites don't get handled properly

[nicholas-c]

When setting up next.config rewrites, they don't seem to be playing nicely with query parameters with pages router (Could be app router as well, but untested)

Versions

Next version: 5.2.1
Open-next version: 3.5.1

Here's an example rewrites I've put together;

http://github.com/nicholas-c/next-15-open-next-example/

const nextConfig: NextConfig = {
  reactStrictMode: true,
  async rewrites() {
    return [
      {
        source: "/about",
        destination: "/",
      },
      {
        source: "/account/register",
        destination: "/api/auth?tab=register",
      },
      {
        source: "/account/login",
        destination: "/api/auth",
      },
    ];
  }
}

Locally this works as intended, both with yarn dev and yarn start and yields the expected results.

However when built and deployed with Open-next the query parameter gets lost.

https://next-15-en.nich-carter-qza3ng.gymshark-sandbox.tools/account/register
https://next-15-en.nich-carter-qza3ng.gymshark-sandbox.tools/api/auth?tab=register

Additionally to this, because I'm piggy backing on a previous test repo I have for this; When I add back in i18n config into next.config /account/register starts to 404 in the example above.