getInitialProps only run once when _app.js is provided in react hooks scenario.

Bug report

getInitialProps only run once when _app.js is provided in react hooks scenario.

Describe the bug

Assuming we have two files in Pages directory, _app.js and index.js. Both of them are calling getInitialProps, but only the one in _app.js ran successfully.

// _app.js
import React, { memo } from 'react';
import { Container } from 'next/app';
const Index = memo(({ Component, router }) => {
  return (
    <Container>
      <Component router={router} />
    </Container>
  );
});
Index.getInitialProps = async props => {
  console.log(1);
  return {};
};
export default Index;

// index.js
import React, { memo } from 'react';
const Index = memo(props => {
  return <div>index</div>;
});
Index.getInitialProps = async props => {
  console.log(2);
  return {};
};
export default Index;

Only ```1``` logged in the terminal.

To Reproduce

test repo: https://github.com/edwardfhsiao/nextjs-test-ropo

1. git clone https://github.com/edwardfhsiao/nextjs-test-ropo
2. cd nextjs-test-ropo
3. npm i
4. npm run dev

Expected behavior

Should also log 2 in the terminal.

Screenshots

If applicable, add screenshots to help explain your problem.

System information

• OS: macOS Mojave
• Browser (if applies) Chrome
• Version of Next.js: 8.1.0 react: 16.8.6

Additional context

Only happened in react hooks scenario

[Timer]

Please see the documentation about a custom app. You must invoke getInitialProps yourself.

[balazsorban44]

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