Korean typing doesn't work on macOS

If I type Korean(Hangul) on chat bar, it works but strange.
For example, "가, 거, 나, 너" shows "ㄱㅏ,ㄱㅓ,ㄴㅏ,ㄴㅓ"
This make communication difficult.

Mojang said they added Korean typing at 1.9, but it works only at Windows.
I expected it to be solved soon, but it never fixed.

Using:
*macOS Sierra (10.12.5)
Java Version 8 Update 131
Minecraft version 1.12 (vanilla)*