Words per minutes default is 200, and I change to 50, 30, Reading Time of post is always 1 minute.
It has to be so small such as 10 or lower and Reading Time might change a bit.
I guess maybe the root cause might be traditional Chinese , because most of SEO plugin has the same problem, and their help desk says it can’t be fixed in a short time.
Anyway, I am not sure it is a bug or not, but I would like to report it, maybe some people might need it someday!
Thank you for your report and sharing access Yup I can confirm there’s some odd behaviour when there is traditional Chinese text so I have added this to our internal bug tracker