Adding Korean dictionary does not work.

Hi. I’m using and testing scrivener 3 (RC 17) for windows, and encounter a problem shown in the attached animated gif.

As a short explanation, I can not add the Korean dictionary.
I tried to add the English (United Kingdom-en-gb) dictionary, and it works fine.
I’ve not tried all the dictionary in the Download list,
But, I think at least some of dictionaries including Korean have the problem.
I hope this can help to hunt down some bugs.