Thank you for your reply.
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A sample paragraph here in katakana
通報テスト9,通報テスト11,通報テスト8…etc -
A sample search term that you have that is not working
テスト
The “テスト” is not working.
But the “通報” or “通報テスト” seems to be working correctly.
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Confirmation that your site locale is in Japanese or that
search tokenize chinese japanese korean
is enabled
Yes, I have confirmed that both settings are set correctly.