Unintentional Korean character added at the beginning of a note

This seems IME composition issue. Doubling OS and app(Obsidian) event.

The problem is, isComposing: ture even after a key event. (e.g. enter, esc …)
KeyboardEvent: isComposing property - Web APIs | MDN

AFAIK many services solve this CJK IME problem by early returning if isComposing.
I know nothing about React, but this is a case in React project:

const handleKeyDown = (event: React.KeyboardEvent) => {
    if (event.nativeEvent.isComposing) return;
    ...
};