Smooth scroll is not apply to ToC list which Korean word included

As I know that smooth scroll is standard in webflow.
However I found that smooth scroll is not working properly with ToC.
When I click ToC list which is Korean word or contain Korean word, it just quickly moves without scroll animation.

I have tested a hundred times with many kind of ToC javascript and many kind of brower and mobile phone… all the same problem.

Here is test link.

in ToC, 3rd and the last one is not working.