Letters that are supposed to be bold are not bold

Letters that are supposed to be bold are not bold

What I expected to happen was...:
I would expect those letters to be bold because it's really annoying for me because i use them a lot(and everyone from iceland).

What actually happened was...:
The letters are not bold.

Steps to Reproduce:
1. Go on any server or just singleplayer
2. Write any of these letters in the chat --> ý, ð or þ
3. And then you can see they are not bold like normal letters