Webpack module federation breaks with multiple entrypoints

This time it's @sokra who told me this is probably the place to open an issue.

• Operating System: Windows 10
• Node Version: 12.16.2
• NPM Version: 6.14.4
• webpack Version: 5.0.0-beta.22
• webpack-dev-server Version: 3.11.0
• Browser: Chrome 84.0.4147.105, Firefox 79.0, Edge 84.0.522.48

• This is a bug

Code

https://github.com/codepunkt/module-federation-examples/tree/dynamic-host-remote

Expected Behavior

Using webpack-dev-server instead of webpack should still support module federation with additional content tacked onto the remoteEntry by defining it as an additional entry.

Actual Behavior

Running "yarn start" to start webpack-dev-server breaks module federation and thus breaks the app in development mode.

For Bugs; How can we reproduce the behavior?

1. clone repository
2. ensure you're on branch "dynamic-host-remote"
3. run yarn on repo root
4. go into "dynamic-host-remote" directory
5. run yarn start in "dynamic-host-remote" directory
6. open localhost:3001 in the browser
7. encounter an error in the browser console that happens when executing app2/remoteEntry.js with the additional contents that were added to this entrypoint by webpack-dev-server
8. OPTIONAL: run yarn build && yarn serve and revisit localhost:3001 to see production build working just fine.

Clone the linked module-federation-examples repository, check out dynamic-host-remote, install dependencies, and run yarn start in that directory. Compare the failing localhost:3001 development run with yarn build && yarn serve, which reportedly works. Investigate the additional contents added to app2/remoteEntry.js; done means module federation works with webpack-dev-server and the additional entry content.