I'm trying to create a category selector in header panel to filter out the area based on province name in Korean language.

I made it sure that the correct feature layer gets filtered under the actions tab, and the interface displays everything correctly.
However, when I select one of the province, the map displays nothing. It filters out everything including the selected group value.

So I tried to convert the Korean-font-value field to english to see if it's a language issue, and it seems like it's an language/font issue.
I configured the group value to use the english-converted field, and tested out the filter, and it displayed the selected value correctly. (This case, City of Seoul)

Is this a known bug/issue? I'd be happy to share the data.