Korean is a language where consonants and vowels combine to form a single syllable.

When changing the OS input source to Korean and typing in Neovide input mode, the first syllable entered is separated.
(Immediately after changing the input source, only the first character is separated, and subsequent typing is entered correctly.)

I reported the issue on Neovide and I got clue on winit.

Could you please check this issue history? (I'm not good at english..)