Problems with using Japanese URLs include decreased browser compatibility and negative effects on SEO. The solution is to use Post ID. Then, the URL will not contain Japanese characters, and the uniqueness of the URL will be guaranteed.
The implementation method is to use the Custom Post Type Permalinks plugin and specify %post_id% in the permalink settings. However, the Custom Post Type Permalinks plugin is old, so use it with caution. If you have any other new plugins, please let me know.
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