It isn't. The problem used to be default installed macOS with language set to English put Japanese first (as in CJK) in the language preferences list so they di

It isn't. The problem used to be default installed macOS with language set to English put Japanese first (as in CJK) in the language preferences list so they display Simplified Chinese / Traditional Chinese without lang tag wrong. It looks like now Apple flipped the default to Simplified Chinese first maybe.