// Auth React remote dispatches: dispatch ( setIsLoggedIn ({ isLoggedIn : true }))

// Products Next.js remote reads: const isLoggedIn = useAppSelector ( selectIsLoggedIn ) // → returns FALSE

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You log in. Cart still says you didn't.

If you've built a hybrid micro frontend with React remotes (ModuleFederationPlugin) loaded inside a Next.js host (NextFederationPlugin), you have either hit this bug or you will. Open Redux DevTools and you'll see two store instances — one created by the Auth remote, one created by Products. Each remote dispatched into its own copy.

The contract that fixes it

A federated Redux singleton. One @myapp/store package. The host imports it once, creates the store, wraps the app in ` .…