Webpack2: file reference in importing module is not updated

[aFarkas]

Do you want to request a feature or report a bug?
A bug report.

What is the current behavior?
If a module (i.e: "entry-package.js") is importing another module via code splitting (i.e. import('module-b')) and webpack is watching for file changes and module-b is changed, webpack generates a new chunk with a new filename, but this new filename is not updated in the importing module.

If the current behavior is a bug, please provide the steps to reproduce.

1. Setup webpack with watch: true
2. create a module with the following content:

//module-b.js
export default 'foo';

3. create an entry package with the following content:

//entry-package.js
import('./module-b').then(function(module){
   console.log(module);
});

4. run webpack
5. Change module-b

What is the expected behavior?
First it should output 'foo' after the change it should output the changed value. This happens because entry-package.js is not updated with the new chunk name.

If this is a feature request, what is motivation or use case for changing the behavior?

Please mention other relevant information such as the browser version, Node.js version, webpack version and Operating System.