I have Redux and async actions in getInitialProps, but it will also produce same results w/o redux too.

If getInitialProps function is used for both page and custom _document.js, then the sequence is:

1. Page - getInitialProps
2. Page - getInitialProps dispatches an action
3. store state is now { page: 'ok', doc: 'init' }
4. MyDocument - getInitialProps
5. Page - renders with `{ page: 'ok', doc: 'init' } that's the problem, render happens before _document's getInitialProps call
6. MyDocument - getInitialProps dispatches an action
7. store is now { page: 'ok', doc: 'ok' }
8. MyDocument - renders with { page: 'ok', doc: 'ok' }

So it seems, that MyDocument.getInitialProps is executed on page render, but I think, that such custom lifecycle methods should be called in sequence, before render, let's say, Page then Doc, so that on render everything is consistent.

Master branch of https://github.com/kirill-konshin/next-redux-wrapper contains the example.