UI escape sequence returns wrong particle in Korean grammar

[Elnarfim]

There's an UI escape sequence for Korean postpositions (https://en.wikipedia.org/wiki/Korean_postpositions)
It returns appropriate object particles for consonants and vowels but now it works in reverse

For example:

a string '브란의 끝내주는 알' has a consonant 'ㄹ' in the last word so the object particle after '알' should be '이' but UI escape returns '가' in reverse
I hope KR staffs are aware of that issue since 11.1 release