its an IME bug and software is ripe with them. you need to do a check to see if the user “isComposing” (i think is the function). because enter is used in IME to pick characters based on input. its the same with japanese and chinese. whole slew of US based SaaS products never deal with it and it makes input unbearable for these languages.
Oh! TIL! Thanks for sharing that, I don't do web stuff much these days but will keep it in mind next time I do.