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There could be several reasons why the locale props for react-calendar is not functioning properly in a Next.js application.

1. One reason could be that the Locale prop is not being passed correctly to the react-calendar component. Make sure that the locale prop is being passed as a string and that it is formatted correctly.

2. Another reason could be that the locale files are not being imported correctly. Make sure that the locale files are being imported at the top of your component and that the file path is correct.

3. Next.js has some specific requirements for loading locale data depending on the version of Next.js you are using. You may need to use a specific Next.js plugin or package to properly load locale data.

4. It is also possible that the issue is related to the version of react-calendar you are using. Make sure you have the latest version of react-calendar and that it is compatible with the version of Next.js you are using.

Overall, it is important to carefully check the documentation for react-calendar and Next.js to ensure that you are following the correct guidelines for using locale data.