nextjs上でPOSTしてページ遷移後にリロードするとSafariとChromeで挙動が違う

// pages/index.tsx
function Page() {
  return (
    <div>
      <form action="/register" method="POST">
        <button type="submit">Submit(POST)</button>
      </form>
    </div>
  );
}

export default Page;

// pages/register.tsx
import React from "react";
import { GetServerSideProps, GetServerSidePropsContext, NextPage } from "next/types";

export type Props = {
  requestMethod: string;
};

const Page: NextPage<Props> = (props) => {
  return (
    <div>
      <h1>Request Method: {props.requestMethod}</h1>
    </div>
  );
};

export const getServerSideProps: GetServerSideProps = async ({ req }: GetServerSidePropsContext) => {
  return {
    props: {
      requestMethod: req.method,
    },
  };
};

export default Page;