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There are several potential solutions to this issue:

1. Ensure that the handler function is correctly updating the state in the Context.js file. You can verify this by console logging the state before and after the update.

2. Make sure that the component consuming the context is correctly accessing the state through the provider component. This can be checked by console logging the state within the component and verifying that it matches the state in the Context.js file.

3. Check if there are any race conditions or asynchronous updates occurring that may be causing the state to not update as expected. You can use React Dev Tools to inspect the component tree and see if any updates are occurring out of order.

4. If the issue persists, consider using a state management library such as Redux to simplify your state management and ensure consistent updates throughout your application.