observer doesn't re-render functional components

[Denis Gordeev]

Intended outcome

Functional component re-render after observable property change.

Actual outcome

Functional component doesn't react to observable property change.

How to reproduce the issue

https://codesandbox.io/s/mobx-react-7x-1qnp6?file=/src/App.tsx

[Michel Weststrate]

Please follow the migration guide first: https://mobx.js.org/migrating-from-4-or-5.html

[Denis Gordeev]

Thanks!