WP2.6 word count malfunctioning in Chinese

I was upgraded to 2.6 recently. But I immediately found that the new feature ‘word count’ worked incorrectly.

It works perfectly in English. But it counts a paragragh of Chinese words as 1 instead of a Chinese word as 1. For example, the following words quoted shoule be 13 words, but the ‘word count’ counts it only two words.

這是測試用的

但顯示卻不正常

Do anyone have this problem like me? And do anyone know how to solve this problem?

Thanks for answering.